Anna's hummingbirds eat more insects than any other North American hummingbird, and this may help them in bad weather. It is thought that Anna's hummingbirds are able to spend the winter so far north because they eat more insects and spiders than most hummingbirds. This food provides nutrients during the winter when there are fewer flowers blooming and provides a slower metabolizing source of food that may help the birds survive the long nights. Since so many people have planted ornamental, flowering plants in California over the past 50 years, these birds have been able to greatly expand their rangeIn biology, the total area in which an individual or species can be found..
Male Anna's hummingbirds have bronze-green upperparts, gray undersides, and a irridescent red hood and throat that may appear black or dark purple in low light. Females are gray and do not have the red hood and throat.
Usually a male calls to a female to show her his beautiful feathers. Some male hummingbirds attract a female by forming a group called a "lekAn area where males of one species gather to attract and breed with females of the same species. Can also be a group of males, such as a lek of hummingbirds, that band together to get the females' attention.." A lekAn area where males of one species gather to attract and breed with females of the same species. Can also be a group of males, such as a lek of hummingbirds, that band together to get the females' attention. can have up to 100 males. If a female seems interested in one of the males, he may perform a flying dance for her in the air. Once they mate, the female builds a nest and raises her young all by herself.