High altitudes may be a climate refuge for some birds, but not these hummingbirds
After being moved to a spot high above their typical home, Anna’s hummingbirds seemed to struggle to hover in the thin air.

High altitudes may be a climate refuge for some birds, but not these hummingbirds

After being moved to a spot high above their typical home, Anna’s hummingbirds seemed to struggle to hover in the thin air.