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Defending Food
Hummingbirds must eat more than their weight in food each day, so it's no wonder they feed frequently and defend flowers and feeders vigorously.

"It is calm in the yard until a hummer approaches one of our feeders. Immediately, three others begin to chirp loudly and dive-bomb the trespasser." David Armstrong   Katy, Texas   08/26/14

Wikimedia: Jeffrey W. of Illinois
Hummingbird: Defending Food Sites