Results. Subspecies There are no subspecies of Anna's Hummingbird. Anna’s hummingbirds typically have 2 or 3 broods per year, and there is another Anna’s hummingbird nest now in a neighbor’s small tree close to a stairway that leads to our back yard. Big birds such as hawks, owls, crows, roadrunners, orioles, grackles, gulls, and herons can be hummingbird predators. NPS. Anna’s also take advantage of the hummingbird’s motto “When things get tough, the tough go to sleep.” A hummingbird in torpor can drop its body temperature from about 40°C to about 9°C (from 104°F to 48.2°F) and reduce its respiration rate from 245 breaths per minute to 6. They have a scratchy, squeaky chittering sound and also produce a sound like “chip chip” or “chik chik” by vibrations of their tail feathers similar to the sounds through a reed of a musical instrument. The Anna's hummingbird, (Calypte anna) is one of the most noisy of the little birds. In recent years they have been found more often in backyard gardens where hummingbird feeders and exotic plantings provide them with food throughout the year. In order to protect the birds, be wise to where and what time of day you hang your feeder. The free-flight responses of Anna’s hummingbirds (Calypte anna) to different optic flow cues were studied in a circular chamber that included a projection screen with a feeder in the center, and a 3D tracking system to measure head position (Fig. Some dangerous predators lie in wait for the hummingbird. I can’t be sure, but I think it is the mama who nested in our yard, doing her best to raise another couple of healthy chicks. Again, hummingbirds are aggressive and have been known to fend off large hawks and other birds from their territories. Snakes and lizards hide near a bush or a house. Cats and other hummingbird predators may also stalk your feeder. So in the new study, Clark and colleagues put tail feathers from 14 species of "bee" hummingbirds—a rowdy group that includes the Anna's hummingbird—into a wind tunnel. Hood and throat are iridescent red, may appear black or dark purple in low light; broken white eye-ring is usually visible. ANNA'S (the book) Hummy (the book) Books Hummingbird Flowers Hummingbirds 101 How to Attract Hummingbirds Feeding Hummingbirds Injured hummer Predators Albino/leucistic Look-alikes Endangered Hummingbird Messenger (e-letter) Sponsors Interesting Facts It has been discovered that Anna's Hummingbirds use their tail feathers to … relatively few known predators of hummingbirds, listing among insects only praying mantids (two instances) and referring to Grant's (1959) description of attacks on hummingbirds by wasps. Anna's Hummingbird: Medium hummingbird; male has bronze-green upperparts, dull gray underparts. The Anna’s hummingbird stays year round in the northern Sonoran Desert. 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