Berkeley research finds feeders literally reshaped Calif. hummingbirds

SFGATE·May 27

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1

Backyard feeders are reshaping hummingbirds

The Wildlife Society·Jul 18

2

California's Hummingbirds Have Changed Their Beaks in Response to Backyard Feeders, Study Finds

Smithsonian Magazine·May 27

3

Backyard feeders changed the shape of hummingbird beaks, scientists say

NPR·May 23

4

Watch How Hummingbirds Fly Through Narrow Spaces

Smithsonian Magazine·Nov 14