Finding the world's most extraordinary birds

Use this app to find out which bird species in your life list have the highest EDGE scores . If you use eBird to keep track of your sightings, simply upload your eBird data in the "eBird data" tab. If you do not use eBird to keep track of your sightings, you can use the "Explore" tab to browse and select from the complete EDGE list of 10,960 bird species in the BirdLife International taxonomy.

EDGE scores are a product of how Evolutionarily Distinct (ED) and Globally Endangered (GE) a bird species is. Evolutionary Distinctiveness is a measure of how unique a species is, based on the number of living relatives it has, and its evolutionary distance from these relatives. Global Endangerment status for each species is based on the IUCN Red List of Threatened Species assessments undertaken by BirdLife International, the IUCN Red List Authority for birds.

Abundant species that have many close relatives, such as most gulls (blue branches in the tree on the left), have low EDGE scores. Critically Endangered species that have few living relatives, such as the California Condor (red branch), have a high EDGE score.

EDGE scores are produced and updated by the EDGE of Existence Programme at the Zoological Society of London (ZSL) to highlight the need to preserve the world’s most unique and endangered species.

App by Simón Valdez-Juarez &
Sebastián Pardo
Source code available on GitHub

# 915

Red-tailed Tropicbird

Phaethon rubricauda

EDGE Score: 3.51

Ⓒ Simon Valdez-Juarez
Least Concern

Upload file

You can obtain a .csv file with your eBird data by clicking on the following link (Make sure you're logged into eBird):

An email with a download link will be sent to you shortly after confirming the request (pressing 'Submit') through that link.

My eBird life list

# 388

Hooded Plover

Thinornis cucullatus

EDGE Score: 4.17

Ⓒ Alice Domalik

With this tab you can:

Search for individual species using the search box

Sort species by their scores, rank, or names using the small arrows on top of each column

Filter species using the boxes at the top of each column

Create your EDGE checklist by clicking on each species

Download your EDGE checklist

Get PD score of your checklist

Download my checklist

Calculate how many million years of evolution are contained in your checklist, using the button below.


Explore the complete EDGE bird list

# 8

Northern Bald Ibis

Geronticus eremita

EDGE Score: 5.78

Ⓒ Rafa Benjumea - Ecotono Birding

Join the EDGE Challenge!

Together we can give future generations a chance enjoy the world's most extraordinary birds!

You can help to fund future EDGE fellows by donating to the EDGE of Existence Programme.

Use the buttons below to find out the sum of your top 5 EDGE birds scores.



After you find your score go here to support EDGE Fellows with a donation for the amount of your score.

Learn more about EDGE scores for birds.

Saving the world's most extraordinary birds

ZSL's EDGE of Existence Programme supports local conservation leaders via EDGE Fellowships. EDGE Fellows work to save the world’s most unique and most threatened species, such as the Philippine Eagle (Pithecophaga jefferyi).

The Philippine Eagle was never a common bird within the four islands of the Philippines where it dwells. Habitat destruction and hunting further reduced the range and numbers of this Critically Endangered bird.

EDGE fellow Kahlil Panopio and Haribon , a Philippine NGO, identified remaining critical habitat in Mt. Mingan. They worked with local communities and governments to shift attitudes toward conservation of this emblematic bird. Thanks to their efforts, 8,227 hectares of critical habitat will soon be declared a protected area.

# 15

Philippine Eagle

Pithecophaga jefferyi

EDGE Score: 5.64

Ⓒ Alain Pascua