Merlin Bird ID by Cornell Lab icon
Merlin Bird ID: Comprehensive Review of Cornell's Avian Identification Platform

by Cornell University

4.9
IOSReference
Cornell Lab's Merlin Bird ID app uses advanced AI and the eBird database to identify birds through multiple methods. Designed for both casual observers and serious birders, it transforms mobile devices into powerful ornithological tools.

Detailed Review

Merlin Bird ID represents a significant advancement in avian identification technology, leveraging Cornell University's extensive ornithological research and the massive eBird database. The application serves as a digital field guide that utilizes machine learning algorithms to identify species through visual, auditory, and descriptive inputs, positioning itself as a premier tool in the birding app market. The application offers four distinct identification methods: a question-based identification system that analyzes physical characteristics and behavior, photo recognition technology that processes user-submitted images, audio analysis that identifies species through recorded bird songs, and regional exploration features that show likely species based on location and season. Each method draws from eBird's database containing millions of bird sightings, photographs, and audio recordings, providing exceptionally accurate results across North American and global species. User experience demonstrates thoughtful design with an intuitive interface that prioritizes accessibility. The app functions efficiently in field conditions, with offline capabilities for remote areas and rapid processing times for both visual and audio identification. Real-world usage patterns show particularly strong adoption among hikers, backyard bird watchers, and educational groups, with many users reporting successful identifications even with partial sightings or distant audio recordings. User feedback trends overwhelmingly positive, with numerous reviewers noting transformative experiences with bird identification. User FunWithFlags_68 (August 4, 2025) reported the app 'completely changed' their engagement with birding, while Dixonclarke (August 5, 2025) specifically noted successful identification of red-shouldered hawks and hairy woodpeckers. Some technical issues have been reported, including microphone access problems noted by Alyce69 (August 4, 2025), though these appear isolated rather than widespread. The application demonstrates notable strengths in its comprehensive database integration and multiple identification methodologies, though limitations include occasional regional database gaps for less common species and the inherent challenges of audio identification in noisy environments. Ideal use cases include educational settings, casual bird watching, and supplemental use for professional ornithological work, particularly when used alongside traditional field guides for verification.

Key Features

  • Photo ID technology analyzes uploaded bird images using machine learning algorithms to provide instant species identification with remarkable accuracy
  • Sound ID feature records and analyzes bird vocalizations in real-time, displaying potential matches as birds sing with visual waveform analysis
  • Bird ID questionnaire uses intelligent filtering based on location, size, colors, and behavior to narrow down species possibilities systematically
  • Explore Birds function provides location-based bird lists with seasonal abundance data drawn from eBird's extensive sighting database
  • Offline functionality allows identification in remote areas without cellular service by downloading regional bird packs in advance
  • Life list tracking automatically records identified species with timestamps and locations for personal birding records and documentation

Why Users Love It

Comprehensive database integration
Multiple identification methods

Perfect for: Bird enthusiasts from casual observers to serious ornithologists

Screenshots

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Ranking History

Track Merlin Bird ID by Cornell Lab's performance in Reference over the last 30 days

Top 5
Top 10
Top 15
Below 15

Current Rank

#23

1 from last week

Best Rank

#15

All-time high

Average Rank

#19

30-day average

User Reviews

JackalPlays
Aug 2, 2025

I first got Merlin somewhere between winter and spring, and it has been incredible throughout the year. For context, I really like photography, specifically of birds. This app has allowed me to identify the birds I take photos of thanks to the large amount of sample images they showcase of each type of bird. Not only this, but it has also taught me the differences between several of the female birds in my area (house sparrows and house finches. They look fairly similar until you know what patterns to look for.) this app has also helped me find birds I never would have even imagined I could find, thanks to the fact it can take audio recordings and identify what birds are singing in them. I found a lazuli bunting thanks to this app, a male at that, and was able to get photos of him. If I hadn’t had Merlin, I never would have known a bright blue bird was singing just across the road. I have learned so much about the birds in my neighborhood, and thanks to Merlin I’m able to get excited knowing what each type of bird is. Amazing + Accurate I first got Merlin somewhere between winter and spring, and it has been incredible throughout the year. For context, I really like photography, specifically of birds. This app has allowed me to identify the birds I take photos of thanks to the large amount of sample images they showcase of each type of bird. Not only this, but it has also taught me the differences between several of the female birds in my area (house sparrows and house finches. They look fairly similar until you know what patterns to look for.) this app has also helped me find birds I never would have even imagined I could find, thanks to the fact it can take audio recordings and identify what birds are singing in them. I found a lazuli bunting thanks to this app, a male at that, and was able to get photos of him. If I hadn’t had Merlin, I never would have known a bright blue bird was singing just across the road. I have learned so much about the birds in my neighborhood, and thanks to Merlin I’m able to get excited knowing what each type of bird is.

IworkInQA
Aug 1, 2025

Identifies birds by call/song, or picture. It doesn’t always get it right, but 90% of the time it does. And it seems to be getting better. Amazing Identifies birds by call/song, or picture.It doesn’t always get it right, but 90% of the time it does. And it seems to be getting better.

GLawley
Aug 2, 2025

Merlin is one of my favorite apps! So helpful in identifying birds, which is actually a fun activity! And it is exciting when you discover a “new” bird in your yard! Merlin Merlin is one of my favorite apps! So helpful in identifying birds, which is actually a fun activity! And it is exciting when you discover a “new” bird in your yard!

Tn Kandy
Aug 3, 2025

As a new bird watcher/photographer this has been an incredible help! I love everything about it. The only thing missing is an average size, or size range, to help in finding an unknown bird. Excellent As a new bird watcher/photographer this has been an incredible help! I love everything about it. The only thing missing is an average size, or size range, to help in finding an unknown bird.

Dixonclarke
Aug 5, 2025

This amazing app has helped me to further identify local birds. Found out I had red shouldered hawks and hairy woodpeckers! Incredible This amazing app has helped me to further identify local birds. Found out I had red shouldered hawks and hairy woodpeckers!

App Details

Developer

Cornell University

Platform

ios

Rating

4.9

Last Updated

10/7/2025