Hungry Hummingbirds

Hummingbirds: Cute little nectar sippers, or battle-hardened killers? This is Sandra Tsing Loh with the Loh Down on Science. Hummingbirds are darling! But it’s a bird-eat-bird world –sometimes they have to fight to survive! At University of California, Berkeley, Alejandro Rico-Guevara studies the evolution of hummingbirds. He wondered: What can

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