Icons
Game-icons.net
Bird family silhouettes used in the bird-watching counter are from the Game-icons.net collection by Lorc, Delapouite, Caro Asercion and contributors. Licensed under CC BY 3.0.
Modifications: black background removed, foreground re-coloured to currentColor so the icons inherit our theme. Filenames simplified.
Font Awesome Free
Interface icons throughout the site are from Font Awesome Free, by Fonticons, Inc. Icons licensed under CC BY 4.0; fonts under SIL OFL 1.1; code under MIT.
Data
AviList — Global Avian Checklist v2025
The bird-species autocomplete (10,930 species across 251 families) is built from the AviList: The Global Avian Checklist, v2025 (published 11 June 2025), the unified successor to IOC, eBird/Clements, HBW and Howard & Moore. Licensed under CC BY 4.0.
Citation: AviList Core Team. 2025. AviList: The Global Avian Checklist, v2025. https://doi.org/10.2173/avilist.v2025
Modifications: filtered to species rank only, dropped extinct/possibly-extinct entries, mapped to a compact JSON of common name + scientific name + family.
JavaScript libraries
D3.js
Charts on counters, dashboards and statistics pages use D3.js by Mike Bostock and contributors. Licensed under ISC.
Chart.js
The statistics page uses Chart.js by Chart.js contributors. Licensed under MIT.
Alpine.js
Several interactive UI surfaces use Alpine.js by Caleb Porzio and contributors. Licensed under MIT.
Fonts
Inter, Fraunces, Instrument Serif & JetBrains Mono
Typefaces are served via Google Fonts, each licensed under the SIL Open Font License 1.1. Thanks to Rasmus Andersson (Inter), Phaedra Charles & David Jonathan Ross (Fraunces), Instrument (Instrument Serif) and JetBrains (JetBrains Mono).
