eBird

Zotero

zotero.org

BirdEye

birdeye.com

Wikispecies

wikimedia.org

birdie care

birdie.care

PaperBrain

paperbrain.study

NetBird

netbird.io

All About Birds

allaboutbirds.org

Bird

bird.com

Avian

avian.io

Birdy

mybirdy.co.uk

iNaturalist

inaturalist.org

EvidenceHunt

evidencehunt.com

Tinybird

tinybird.co

BibBase

bibbase.org

References.net

references.net

Refden

refden.com

Bird Eats Bug

birdeatsbug.com

ReplayBird

replaybird.com

BirdDog Software

birddogsw.com

Birdi

birdi.io

Birdview

birdviewpsa.com

BirdDog

servicetrade.com

Redbird

redbird.io

EagleIO

eagle.io