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The span between precocial and altricial species is particularly broad in the biology of birds. Precocial birds hatch with their eyes open and are covered with downy feathers that are soon replaced by adult-type feathers. [17] Birds of this kind can also swim and run much sooner after hatching than altricial young, such as songbirds. [17]
Fish generally do not incubate their eggs. However, some species mouthbrood their eggs, not eating until they hatch. Some amphibians brood their eggs. The female salamander Ensatina (Ensatina eschscholtzii) curls around the clutch of eggs and massages individual eggs with her pulsating throat. [14]
Most fish species spawn eggs that are fertilized externally, typically with the male inseminating the eggs after the female lays them. These eggs do not have a shell and would dry out in the air. Even air-breathing amphibians lay their eggs in water, or in protective foam as with the Coast foam-nest treefrog, Chiromantis xerampelina .
The rock dove, rock pigeon, or common pigeon (/ ˈ p ɪ dʒ. ə n / also / ˈ p ɪ dʒ. ɪ n /; Columba livia) is a member of the bird family Columbidae (doves and pigeons). [3]: 624 In common usage, it is often simply referred to as the "pigeon", although this is the wild form of the bird; the pigeons most familiar to people are the domesticated form of the wild rock dove.
Pigeon is a generalized term for a variety of breeds and even species of birds, but the urban pests most people use the word for are technically “rock doves.” The wild version of the animals ...
The International Ornithological Committee (IOC) recognizes 352 species in family Columbidae, the pigeons and doves. They are distributed among 50 genera. They are distributed among 50 genera. This list is presented according to the IOC taxonomic sequence and can also be sorted alphabetically by common name and binomial.
The spawn (eggs) of a clownfish.The black spots are the developing eyes. Spawn is the eggs and sperm released or deposited into water by aquatic animals.As a verb, to spawn refers to the process of freely releasing eggs and sperm into a body of water (fresh or marine); the physical act is known as spawning.
The three Western European Columba pigeons, common wood pigeon, stock dove and rock dove, though superficially alike, have very distinctive characteristics; the common wood pigeon may be identified at once by its larger size at 38–44.5 cm (15– 17 + 1 ⁄ 2 in) and weight 300–615 g (10 + 5 ⁄ 8 – 21 + 3 ⁄ 4 oz), and the white on its ...