The rufous-tailed hummingbird (Amazilia tzacatl ) is a medium-sized hummingbird in the "emeralds", tribe Trochilini of subfamily Trochilinae. It is found from east-central Mexico through Central America and Colombia into Ecuador and Venezuela.
Like most hummingbirds, the rufous-tailed feeds on nectar and small insects. It is common at sugar water feeders and often seen in coffee and banana plantations. It is extremely territorial and aggressive at feeding sites such as flower patches and feeders, from which it chases other hummingbirds and large insects.
The rufous-tailed hummingbird is polygynous. Though it is aggressive while feeding, the species sometimes nests in loose colonies. Its breeding season varies widely across its range, but is within the February to November span. The female is entirely responsible for nest building, incubation of eggs, and care of nestlings. She lays two white eggs in a compact cup nest constructed from plant fibers, leaves, and spiderwebs covered with lichens and mosses. It is typically placed up to 6 m (20 ft) high on a thin horizontal twig. Incubation takes 15 to 19 days, and fledging another 18 to 22 days.
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