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Merlin Bird ID and eBird solve different parts of a migrating-raptor watch. Open Merlin when you have a usable photograph, a description, or a call and need a species suggestion. Open eBird to find active hawkwatch locations, check which raptors are being reported, see seasonal timing, and submit a countable checklist. For the usual hawkwatch view—a distant, often silent bird reduced to shape and flight—neither is the specialist identifier. HawkWatch International’s free Raptor ID app and a flight-identification guide are better tools for that job. The most reliable setup is therefore a stack: eBird for planning and records, Raptor ID or a printed guide for distant flight identification, and Merlin for close photos, calls, and likely-species context.
Merlin and eBird are companion products from the Cornell Lab of Ornithology, not interchangeable rivals. “Merlin works out what a bird is; eBird records that you saw it.”
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| Name | Best for | Key spec | Free plan / price | Platforms | Checked |
|---|---|---|---|---|---|
| Merlin Bird ID | Identifying a close, photographed, described, or calling bird | Four ID routes; 10,000+ species in the field guide; Sound ID covers 2,000+ species | Free; no in-app purchases | iOS 18+; Android 7+ | November 2026 |
| eBird | Finding reports, planning a watch, and submitting a complete checklist | Hotspots, recent sightings, maps, bar charts, effort and count data | Free; no in-app purchases | iOS and Android; offline data collection | November 2026 |
| Raptor ID | Identifying North American diurnal raptors in flight | 34 species; nearly 1,000 annotated photos and in-flight videos | Free | iOS and Android | November 2026 |
Details checked November 2026.
What is the difference between Merlin and eBird?
Merlin is an identification guide; eBird is a sightings database and checklist tool. Merlin suggests which species matches an individual bird. eBird records where, when, how, and how many birds you observed, then makes those data useful to other birders and scientists.
Merlin offers four main routes on its current official site: Sound ID, Photo ID, step-by-step identification, and Explore Birds. Its field guide contains identification text, photographs, sounds, maps, and regional information for more than 10,000 species. The app is powered by eBird observations and Macaulay Library media, while its range maps draw on Birds of the World data. Cornell’s Merlin home page describes it as a free guide to birds anywhere in the world.
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eBird asks a different set of questions: Where did you bird? When did you start and finish? What species did you see or hear, and in what numbers? Its mobile app supports offline data collection worldwide. You can start a checklist at a formal hawkwatch hotspot, a personal location, or a GPS point; record duration, distance, and counts; and submit the list when you reconnect. eBird’s official About page explains how those records support research, conservation, and education.
An identification in Merlin does not automatically create an eBird checklist. A recording made in Merlin Sound ID stays on the phone unless you export it and add it to an eBird checklist manually. You can link an eBird life list inside Merlin so observed species receive check marks, and eBird can open a species account in Merlin, but the two apps still require separate actions.
Is eBird better than Merlin for a hawk watch?
eBird is better for the planning, reporting, and evidence side of a hawk watch; Merlin is better for naming a bird when you have enough detail. Neither app replaces the other, and neither is a dedicated distant-flight identifier.
| Hawkwatch task | Best choice | Why |
|---|---|---|
| Check which raptors are being seen today | eBird | Recent sightings, hotspot pages, maps, and filters show current local reports. |
| See when a migrant usually passes | eBird and Merlin Explore Birds | eBird supplies the underlying observations; Merlin presents location-and-date likelihoods and bar charts. |
| Name a perched or close raptor from a good photo | Merlin Photo ID | Wing, tail, head, and plumage detail give the model useful evidence. |
| Name a distant, silent bird in a thermal | Raptor ID, a flight guide, and observer skill | The decisive clues are silhouette, wingbeat, soar pattern, proportions, and context—not a detailed photograph or song. |
| Submit counts and effort | eBird | A checklist preserves numbers, time, distance, location, and observation conditions. |
eBird receives more than 100 million bird sightings each year, with average participation growth of approximately 20% year over year — eBird / Cornell Lab of Ornithology, current official About page. Those contributions make eBird useful before and after a watch, not because it automatically identifies a bird in front of you.
Can Merlin identify hawks in flight?
It can help when the hawk is close enough to photograph or when you can describe it clearly, but distant migrating raptors are Merlin Photo ID’s weakest scenario. A bird high overhead may be backlit, tiny in the frame, and missing the breast, eye, and tail details that a perched-bird identification depends on.
Independent reviewer Sneed B. Collard III reported that Merlin Photo ID had more trouble with birds that were poorly lit or farther away, while still finding it an excellent tool for beginning and intermediate birders. That limitation maps directly onto a classic hawkwatch. Do not point the app at a thermal full of specks and treat its top result as a confirmed species. There is no Cornell-published accuracy percentage for Photo ID on soaring raptors and no head-to-head trial of Merlin against eBird or Raptor ID, so a numerical success rate would be misleading.
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Merlin’s step-by-step route can narrow possibilities when you can reliably answer questions about size, color, activity, and location. It is useful for checking whether a Broad-winged Hawk is plausible at your watch site this week. It is much less dependable for resolving a distant Sharp-shinned Hawk versus Cooper’s Hawk when the observer cannot see the diagnostic structure.
When should I use Merlin Sound ID?
Use Sound ID for a calling hawk, owl, or background songbird—not as the default way to identify a silent soaring migrant. Most migrating raptors at a watch are identified visually by shape and flight, and many make no audible call that reaches the observer.
Sound ID currently identifies more than 2,000 species, covering most birds of the United States, Canada, and Europe plus common widespread birds in India and Central and South America — Cornell Lab of Ornithology Sound ID help, modified 2026. At launch in 2021, Merlin recognized more than 400 U.S. and Canadian species — eBird / Cornell Lab of Ornithology, 2021. Training a new species requires at least 150 recordings from the Macaulay Library — Cornell Lab of Ornithology Sound ID help, 2026.
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Merlin converts a recording into a spectrogram, a visual representation of volume, pitch, and duration. As Merlin lead researcher Grant Van Horn explained: “Each sound recording a user makes gets converted from a waveform to a spectrogram—a way to visualize the amplitude [volume], frequency [pitch], and duration of the sound.” He added: “So just like Merlin can identify a picture of a bird, it can now use this picture of a bird’s sound to make an ID.”
Sound ID works completely offline, but Cornell warns that similar sounds, quiet recordings, unusual vocalizations, and untrained species can produce failures. Recordings of 10 minutes or less generally give the feature the best working window. Keep location services enabled even when offline so regional likelihoods can be weighted correctly.
What does Merlin Explore Birds add for migration?
Explore Birds is Merlin’s best migration-planning feature, not a replacement for in-flight identification. Set the watch location and date, sort by likelihood, and inspect the bar charts. The current-date marker shows when a species is typically present and helps reveal the short periods when migrants are most likely to pass.
Drew Weber of All About Birds describes the benefit this way: “With a quick glance, you can see which birds are around in which season, and get extra detail about precisely when migrant species are likely to be passing through.” For a hawkwatcher, use that information the night before to make a realistic target list of Buteos, accipiters, falcons, and eagles.
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The list is a probability aid, not a ruling on an individual bird. A rare raptor can occur outside its bar-chart peak, and a common species can be absent on a particular day. Confirm a suggestion against the bird’s shape, flight style, plumage, range, and date.
What can eBird do at a migrating-raptor site?
eBird turns a watch into a documented observation session. Before leaving, open the hotspot page and recent reports to see which lookouts are active and whether a target species is still being recorded. During the watch, start a checklist, capture effort, and enter every species and count you can support. Afterward, submit the list so it joins a long-term dataset.
- Recent reports: See what nearby observers are finding today, while remembering that reports can lag, contain errors, or reflect a different micro-location.
- Hotspots and maps: Compare established watch sites with personal locations and inspect species distributions.
- Seasonal context: Bar charts and maps show when a migrant is expected and where it has been reported.
- Effort data: Record time, duration, distance, and counts rather than only a list of highlights.
- Rarity review: Local filters flag unusual species or high counts for regional review, prompting observers to add notes, photographs, or recordings.
eBird is not an automatic photo or sound identifier. As Collard put it, eBird will not identify a bird directly in the field; Cornell’s sister app, Merlin, supplies that function. A lower store rating does not change the role: a U.S. App Store snapshot from September 3, 2026, showed eBird at 3.9 stars from 809 ratings versus Merlin at 4.9 from 112,000 ratings, with neither app using in-app purchases. Those are moving snapshots, not accuracy measurements.
What is the best app for hawks in flight?
For North American diurnal raptors in flight, HawkWatch International’s free Raptor ID app is the purpose-built choice. It was created with the Cornell Lab of Ornithology and covers 34 species, with nearly 1,000 annotated photographs, in-flight identification videos, range maps, vocalizations, terminology, and age, sex, plumage, and geographic variation.
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HawkWatch describes it as “The first raptor identification app designed for mobile devices” and says its videos are geared toward helping users identify raptors in flight. The app includes voice-over tips from Jerry Liguori, links to interactive seasonal eBird maps, and an “Ask the authors” question forum. Eastern Massachusetts Hawk Watch lists it as the app for this job, while BirdWatching’s field-guide roundup also singled it out for raptor enthusiasts.
Its limits are practical. The app is a reference library rather than a live camera scanner, and its coverage is North American diurnal raptors rather than every bird worldwide. A small Google Play review sample showed about 5,000-plus downloads and roughly 3.6 stars; iOS aggregators list a roughly 766.25 MB package, version 1.0.7, last updated November 17, 2023. Those store snapshots suggest a useful specialist reference that may not be updated as frequently as Merlin, not a defunct app.
For the visual method behind hawkwatching, Hawks in Flight remains the canonical printed companion. The guide by Pete Dunne and David Allen Sibley teaches identification through overall shape, movement, and context—exactly the clues that survive when a bird is a backlit silhouette. Jerry Liguori’s Hawks at a Distance is another specialist option highlighted by HawkWatch International. Neither book turns a distant bird into an automatic ID; both teach the observer what to watch for.
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How should I combine the apps during an actual hawk watch?
Use each tool at the stage where it has the strongest evidence. The sequence below avoids the common mistake of treating a Merlin suggestion as a finished record.
- Prepare the night before. In Merlin Explore Birds, set the exact watch location and date, sort by most likely, and inspect the raptor bar charts. In eBird, open the hotspot, review recent reports, and note which species and counts are being reported.
- Download what will work offline. Over Wi-Fi, install Merlin’s regional bird pack. Set the location in Explore Birds and leave location services enabled. Sound ID can identify species without a bird pack, but Photo ID and detailed species accounts need the relevant pack. Check that the phone meets Merlin’s current floor: iOS 18 or newer, or Android 7 or newer.
- Watch the sky with optics first. Record the bird’s approximate size, wing shape, wingbeat rhythm, soar pattern, tail shape, posture, and behavior before reaching for an app. Note light direction and whether the bird is above, below, or level with the horizon.
- Use Raptor ID or a flight guide for distant birds. Compare silhouettes, morphs, age patterns, and flight videos. Treat location and date as supporting evidence, not proof.
- Use Merlin Photo ID when the image is genuinely detailed. Try a perched bird or a close pass that shows wing and tail structure. If the image is a tiny, backlit speck, record Merlin’s suggestion as a hypothesis only.
- Use Sound ID only when sound is part of the evidence. A calling hawk, owl, or mixed-flock vocalization may be identifiable. A silent thermal is not a Sound ID problem.
- Log the complete watch in eBird. Start the checklist at the site, record duration and distance, enter counts, and include notes for difficult identifications. A count or a carefully explained “present” record is more useful than a list made only of memorable highlights.
- Support unusual records. Do not submit a rare raptor solely because it appeared at the top of Merlin’s list. Add field notes, a photograph, or a recording and expect local review through eBird’s filters.
- Finish the data loop. Export useful Merlin recordings manually if they support the eBird record, and link your eBird life list in Merlin if you want seen-species check marks.
How do I set up Merlin for a remote hawkwatch?
Download the regional pack and configure the location before leaving coverage. A remote ridge is the wrong place to discover that the phone lacks the data needed for Photo ID or species accounts.
- Install Merlin from the official download page.
- Confirm the device requirement: iOS 18 or newer, or Android 7 or newer.
- Download the regional bird pack over Wi-Fi before the trip.
- In Explore Birds, set the watch location and date, then review likely species and bar charts.
- Keep location services on. Merlin can work offline, but location weighting still improves the likely-species list.
- Charge the phone and carry a power bank; a long watch can consume battery through camera use, GPS, and recordings.
- Open the relevant species accounts and save the flight guide or specialist app locally before driving to a weak-signal site.
Merlin has exceeded 10 million downloads and covers more than 10,000 species — Cornell Lab of Ornithology / All About Birds, 2025. Its breadth is useful for a mixed birding day, but global field-guide coverage does not mean Sound ID coverage is global or that every regional raptor is equally represented.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How accurate should I assume an app suggestion is?
Assume that every suggestion is a shortlist, not a confirmation. Cornell’s Sound ID guidance says: “A suggestion from Merlin is just the beginning. You decide if Merlin’s suggestions are a good match for your bird.” It also says, “Merlin is a great birding companion that suggests which species are more likely, but it relies on you to confirm what you’re hearing or seeing.”
For sound, Cornell’s answer to “Is Merlin always right?” is explicit: “No. Merlin shows a list of possible birds based on the songs and calls you recorded, and matches that with the birds that are likely in your area.” Cornell also warns that sound identification is difficult because some birds sound very similar and that seeing the singing bird is the best way to learn.
At a hawkwatch, confirmation means checking at least five kinds of evidence:
- Shape: relative head, wing, and tail proportions.
- Flight style: flap-glide rhythm, soaring circles, rocking, hovering, or direct flight.
- Plumage: visible contrast, bands, windows, or patches—only when light and distance permit.
- Range: whether the species occurs at the site.
- Date: whether migration timing supports the identification.
When the clues disagree, choose a conservative identification or leave the bird unidentified. A defensible checklist is more valuable than a dramatic but unsupported rarity.
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What are the main limitations and ethical rules?
Backlighting, distance, haze, and motion blur are normal hawkwatch conditions, not edge cases. They reduce the information available to any camera-based model. Merlin’s regional likelihood can also make a common species appear prominently even when the individual bird has not supplied enough diagnostic detail.
Do not use playback to attract raptors or other birds, especially near nests or sensitive habitat. Follow the rules of the watch site, avoid disclosing locations of vulnerable nests, and keep observers and equipment away from breeding areas. Share exact locations only when doing so will not create disturbance or collection pressure.
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How were these recommendations chosen?
The ranking follows the actual jobs a migrating-raptor observer must complete: identify an individual, understand what is likely at a place and date, document effort and counts, and handle distant flight views. Merlin ranks first for general identification, eBird for planning and data, and Raptor ID for North American flight identification. The comparison also weighs offline behavior, regional coverage, specialist content, evidence quality, and the distinction between a suggested species and a verified checklist record.
Which bird app should I use at a hawk watch?
Use eBird before the watch to find hotspots and recent reports, Merlin Explore Birds to study seasonal likelihood, Raptor ID or a flight guide to identify distant birds, Merlin Photo ID for close images, and eBird again to submit the complete checklist. If only one of the two Cornell apps can be installed, choose based on the immediate task: Merlin for “what species is this?” and eBird for “what is being reported here, and how do I record my watch?”
Frequently Asked Questions
Can Merlin Bird ID work without an internet connection at a hawk watch?
Yes, if you prepare first. Sound ID works offline, while Photo ID and species accounts require the appropriate regional bird pack downloaded over Wi-Fi; Explore Birds also needs the watch location configured in advance.
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Does saving a bird in Merlin automatically submit it to eBird?
No. Merlin life-list saves, Photo ID results, and Sound ID recordings do not create an eBird checklist automatically. Start and submit the checklist in eBird, then add exported recordings or supporting notes manually.
How should I document a rare raptor in eBird?
Enter the observation with the correct location, date, count, and effort, then add field notes describing shape and flight. Attach a photograph or recording when available; unusual species and high counts may be routed to regional reviewers.
Will Merlin identify a raptor outside North America?
Merlin’s field guide is global, but Sound ID coverage is regional and strongest in the United States, Canada, and Europe, with common widespread species in parts of Latin America and India. Check the available regional pack and coverage before treating a result as evidence.
How much storage does the Raptor ID app need?
An iOS listing aggregated in 2026 reported an install of about 766.25 MB. It is free, but download it on Wi-Fi and leave storage for updates, photos, and recordings from the watch.
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