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The platypus (Ornithorhynchus anatinus), [4] sometimes referred to as the duck-billed platypus, [5] is a semiaquatic, egg-laying mammal endemic to eastern Australia, including Tasmania. The platypus is the sole living representative or monotypic taxon of its family Ornithorhynchidae and genus Ornithorhynchus , though a number of related species ...
There is an inverse relationship between egg weights and laying sequence, [29] wherein earlier eggs are larger than eggs laid later in the sequence. It is possible to induce a female coot to lay more eggs than normal by either removing all or part of her clutch. Sometimes, a female may abandon the clutch if enough eggs are removed.
They are the only group of living mammals that lay eggs, rather than bearing live young. The extant monotreme species are the platypus and the four species of echidnas . Monotremes are typified by structural differences in their brains, jaws, digestive tract, reproductive tract, and other body parts, compared to the more common mammalian types.
If you're looking for a bird that lays eggs that you can eat, runner ducks are it. Females can lay as many as 300 to 350 eggs a year. You'd never have to buy eggs again! The eggs come in shades of ...
As is the case with chickens, various breeds have been developed, selected for egg-laying ability, fast growth, and a well-covered carcase. The most common commercial breed in the United Kingdom and the United States is the Pekin duck, which can lay 200 eggs a year and can reach a weight of 3.5 kg (7 lb 11 oz) in 44 days. [34]
Pekin ducks may lay over 150 white eggs per year. [17]: 193 They are not good sitters, and eggs may need to be artificially incubated. [17]: 193 The American Pekin is sometimes kept for fancy and showing. [16] Show birds are often larger than commercial production stock. [2]: 94
In most species, only the female incubates the eggs. The young are precocial, and are able to feed themselves from birth. [3] One aberrant species, the black-headed duck, is an obligate brood parasite, laying its eggs in the nests of gulls and coots. While this species never raises its own young, a number of other ducks occasionally lay eggs in ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 16 January 2025. Species of bird Mandarin duck Temporal range: Pleistocene – Present, 0.8 – 0 Mya PreꞒ Ꞓ O S D C P T J K Pg N ↓ Male (left) and female (right) mandarin ducks at Martin Mere, UK Conservation status Least Concern (IUCN 3.1) Scientific classification Domain: Eukaryota Kingdom ...