eBird Rarity Mapper

About the tool

This tool helps birders quickly explore notable eBird reports and visualize rarities on an interactive map. It combines a static GitHub Pages frontend with a Cloudflare Worker backend proxy to the eBird API.

The app is hosted at: https://hydrospheric0.github.io/ebird-rarity-mapper/

Features

• Interactive map with rarity markers and county overlays
• Region and species filtering controls
• Lower 48 rarity overlay (ABA code-based)
• Cloudflare Worker backend with CORS support for GitHub Pages
• Fast static frontend deployment on GitHub Pages

How to use

1. Open the app in your browser.
2. Choose a region and (optionally) a species.
3. Adjust days-back and rarity options.
4. Toggle overlays to inspect notable reports and county-level rarity patterns.
5. Click map markers for observation details.

Support this project

If you find this tool useful, please consider supporting its development: