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Bird-eating raptors also tend to show greater sexual dimorphism than other raptors, with the females being larger than the males. [ 2 ] Some avian avivores such as the shikra , besra , Eurasian sparrowhawk , and sharp-shinned hawk catch their prey by flying from cover in a tree or bush, taking their prey unawares.
The species measures 22 centimetres (8.7 in) in length and weighs 17–38 grams (0.60–1.34 oz). [2] The sexes are alike. They have bright green heads, upper parts, and tails; their chins and throats are yellow and outlined in black, with a white extension to the side; their breasts are cinnamon-brown, darkening towards the belly.
Video of a hummingbird building a nest. Male hummingbirds do not take part in nesting. [140] Most species build a cup-shaped nest on the branch of a tree or shrub. [141] The nest varies in size relative to the particular species – from smaller than half a walnut shell to several centimeters in diameter. [140]
The average bird meal consisted of 90.8% honey bees and 9.2% beetles. [28] Predation is more likely when the bees are queening or during the peak of migration, from late March till mid-April, and in mid-September. Hives close to or under trees or overhead cables are at increased risk as the birds pounce on flying insects from these perches. [29]
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In one day, the bee hummingbird may visit 1,500 flowers. [6] It is a diurnal bird that can fly at 40–48 km/h (22–26 kn; 11–13 m/s), and it beats its wings 80–200 times per second, which allows it to remain stationary in the air to feed on flowers. The bee hummingbird lives up to seven years in the wild, and 10 years in captivity. [3]
Energy requirements for hummingbirds do not scale evenly with size increases, meaning a larger bird such as giant hummingbird requires more energy per gram to hover than a smaller bird. [21] The giant hummingbird requires an estimated 4.3 calories of food energy per hour to sustain its flight. [21] This requirement along with the low oxygen ...
This bird breeds in open country in warmer climates. As the name suggests, bee-eaters predominantly eat insects, especially bees, wasps, and hornets. They catch insects in flight, in sorties from an open perch. Before eating a bee, the European bee-eater removes the sting by repeatedly hitting the insect on a hard surface.