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🐦 CA Bird Atlas

Designed to support the California Bird Atlas, powered by eBird / Cornell Lab of Ornithology.

How to use

Tap any block on the map to see its effort statistics. Enable location to automatically track your current block while in the field.

Diurnal hrs

Total hours of daytime survey effort

Nocturnal hrs

Total hours of nighttime survey effort

Checklists

Complete eBird checklists submitted

Confirmed spp

Species confirmed breeding

Coded spp

Species with any breeding evidence code

Overlays

Block outlines

Atlas block boundaries

County outlines

County boundaries (visible at zoom ≥ 10)

Zero effort

Purple outlines — nearby blocks with no checklists yet (loads as you pan)

eBird hotspots

Light gray point layer sized by all-time species richness in the current viewport at zoom ≥ 10; tap a point to open the hotspot and load its atlas block below

Data

Effort data cached hourly from Cornell's GeoServer. Block boundaries © Cornell Lab / eBird.

Enabling location on mobile

Safari (iOS)

Settings → Privacy & Security → Location Services → Safari → While Using. Also check Settings → Safari → Location → Allow.

Chrome (Android)

Tap the lock icon in the address bar → Permissions → Location → Allow. Or: Settings → Site Settings → Location → allow this site.

Firefox (Android)

Tap the lock icon → Edit Site Permissions → Location → Allow.

Samsung Internet

Tap the lock icon → Location → Allow while visiting.

All browsers

Your device-level Location must also be on: iOS Settings → Privacy & Security → Location Services; Android Settings → Location → On.

This project is entirely self-funded and has no affiliation with eBird or the Cornell Lab of Ornithology. Consider supporting eBird.

© Metolius Research / Bart Wickel, 2026