Hummingbirds are the jewels of the bird world, thought by some to be related to Swifts. They eat nectar and tiny insects and must feed almost constantly in order to stay alive. Hummingbirds are able to slow their metabolism and lower their body temperature ("torpidity") at night or when food is scarce. These birds are fiercely territorial and known for spectacular aerial displays. The female alone builds the nest and raises the young. In spring and fall these tiny birds migrate nonstop across The Gulf of Mexico -- 600 miles of water! Despite their small size, Ruby-Throated Hummingbirds are fearless and have an outgoing temperament.