At rest the heart of a hummingbird is beating at about 250 beats per minute
but once in flight, with wings flapping 80 times per second,
it will jump to 1600 beats per minute. Males spend every waking moment fiercely defending food sources, even dive-bombing bald eagles. The females raise two sets of young ones each year on their own and are rather unaffected by the battling males. Migration for these 7-gram dynamos is an individual flight up to 3900kms. This makes it one of the longest migrations in the bird world. First to Mexico/Texas for a short rest and then for many a 500km nonstop flight across the Gulf of Mexico ending in Costa Rica. Most live about 9 years and do this trip twice a year.
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