No bigger than a human thumb, the volcano hummingbird exists only in the Talamancas. "The Hummingbird Effect" premieres Wednesday, April 12 at 8/7c on PBS. [VID: No bigger than a human thumb, the volcano hummingbird exists only here in the Talamancas. She weighs barely as much as a penny and feeds in the shrubs on the tiny mountain flowers that suit her miniature bill. But her appetite is anything but small. She has to replenish 12,000 calories a day. The flowers release only a small serving of

Meet the volcano hummingbird. | Nature | PBS

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