Natural History Wanderings

NPR reports

Bear Divide is unique because it’s like a passageway through the wall of the San Gabriels. Birds are funneled through, Reckling says, and fly low enough for researchers to identify, catch and study the species as they pass. On a really good day, Reckling says, you can see up to 20,000 birds zooming by as they travel north for the summer.

Read on at  On this unassuming trail near LA, bird watchers see something spectacular : NPR