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The egg is not retained in the body for most of the period of development of the embryo within the egg, which is the main distinction between oviparity and ovoviviparity. [1] Oviparity occurs in all birds, most reptiles, some fishes, and most arthropods. Among mammals, monotremes (four species of echidna, and the platypus) are uniquely oviparous.
[89] [77] She lays one to three (usually two) small, leathery eggs (similar to those of reptiles), about 11 mm (7 ⁄ 16 in) in diameter and slightly rounder than bird eggs. [90] The eggs develop in utero for about 28 days, with only about 10 days of external incubation (in contrast to a chicken egg, which spends about one day in tract and 21 ...
Some host species may directly try to prevent cuckoos laying eggs in their nest in the first place – birds whose nests are at high risk of cuckoo-contamination are known to "mob" attack cuckoos to drive them out of the area. [32] Parasitic cuckoos are grouped into gentes, with each gens specializing in a particular host. Some evidence ...
Although its eggs are larger than those of its hosts, the eggs in each type of host nest resemble the host's eggs. The adult too is a mimic, in its case of the sparrowhawk; since that species is a predator, the mimicry gives the female time to lay her eggs without being attacked.
A badger's nest is called a sett. A beaver's nest is called a lodge. An eagle's nest is called an eyrie. [16] An otter's den is called a holt or a couch. A pheasant's nest is called a nide. [17] [vague] A rabbit's nest is called a form. [18] A squirrel's or ringtail possum's nest is called a drey. A wasp's nest is called a vespiary. [19]
The only living mammals that lay eggs are echidnas and platypuses. In the latter, the eggs develop in utero for about 28 days, with only about 10 days of external incubation (in contrast to a chicken egg, which spends about one day in tract and 21 days externally). [11] After laying her eggs, the female curls around them.
Koels usually lay only an egg or two in a single nest but as many as seven to eleven eggs have been reported from some host nests. [37] [38] [39] A female may remove a host egg before laying. Eggs hatch in 12 to 14 days. The young koel does not always push out eggs or evict the host chicks, and initially calls like a crow.
Most arthropods, vertebrates (excluding live-bearing mammals), and mollusks lay eggs, although some, such as scorpions, do not. Reptile eggs, bird eggs, and monotreme eggs are laid out of water and are surrounded by a protective shell, either flexible or inflexible. Eggs laid on land or in nests are usually kept within a warm and favorable ...