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The bird is one of the smallest of the genus Empidonax, measuring 12 to 14 cm [6] [7] in height with a wingspan of 19 to 22 cm [8] and weighing approximately 10.3 g. [9] Its plumage is dull olive-gray on its back and whitish on its belly, notably brighter than the other Empidonax birds.
The ruby-crowned kinglet is a very small bird, being 9 to 11 cm (3.5 to 4.3 in) long, having a wingspan of 16 to 18 cm (6.3 to 7.1 in), and weighing 5 to 10 g (0.2 to 0.4 oz). [17] It has gray-green upperparts and olive-buff underparts. [18] It has two white wingbars and a broken white eye ring.
A bioacoustic analysis performed on both male and female songs revealed that male fee-bee singing fluctuates more, and the absolute amplitude of both sexes is the same. [ 21 ] The most familiar call is the chick-a-dee-dee-dee , which gave this bird its name.
Four studies found the diameter of nests to average from as little as 1.1 m (3.6 ft) and as much as 1.9 m (6.2 ft) and in depth from as little as 1 m (3.3 ft) to as much as 1.3 m (4.3 ft). Generally speaking in woodland or forest edge areas, nests tend to be larger, while those in sparser, more arid areas tend to have characteristically smaller ...
Birds in captivity are often heavier than wild specimens. Migratory birds gain weight before the migratory period but lose weight during handling or temporary captivity. Dead birds tend to weigh less than in life. The weight can vary by 5 to 10%, even during the day. The male emperor penguin loses 40% of its weight during incubation. [12]
After mating, the male builds a nest where each female lays eggs. The nest is a simple scrape in the ground, lined with grass and leaves. [15] The male incubates from ten to sixty eggs. The male will use a decoy system and place some eggs outside the nest, then sacrifice these to predators so they do not attempt to get inside the nest.
The ortolan bunting is 16–17 cm (6.3–6.7 in) in length and has a wing-span of 23–29 cm (9.1–11.4 in). [9] In appearance and habits it much resembles its relative the yellowhammer, but lacks the bright colouring of that species; the ortolan's head, for instance, is greenish-grey, instead of a bright yellow. The song of the male ortolan ...
Ploceidae is a family of small passerine birds, many of which are called weavers, weaverbirds, weaver finches, or bishops.These names come from the nests of intricately woven vegetation created by birds in this family.