Bing found the following results
Birder Definition & Meaning - Merriam-Webster
The Difference Between Bird Watching and Birding
Birdwatching - Wikipedia
Getting started as a birder - National Geographic
How To Begin Birding | Audubon
BIRDER | English meaning - Cambridge Dictionary
eBird - Discover a new world of birding...
Birding | Audubon
How to Start Birding | Audubon
Explore - eBird