Many bird species lay only one egg per clutch, whilst a further large number lay two eggs to guard against the loss of one but never fledge more than one nestling.
An (incomplete) list of birds that lay only one egg would include:
Birds that rear only one chick despite laying two eggs include:
The reason why these species lay only one egg or fledge only one chick is either:
In geological terms, the restraints these species have on fast reproduction are exceptionally typical. It is almost certain that the large clutches (five or more eggs) typical of altricial birds on the extremely young Enriched World soils were unknown before the first ice sheets swept across the northern hemisphere in the late Pliocene. In hot climates, small birds are very long-lived due to the difficulties catching them and the limited, seasonally stable food supply. The small clutches of seabirds and Tropical and Unenriched World landbirds make them very sensitive to disturbance, since population turnover is slow and recovery from losses difficult.
It is important to recognise that species laying only one egg do not necessarily have the highest cost of reproduction. Obligate cooperative breeders such as the Australian mudnesters and Varied Sittella cannot rear a single young without helpers at the nest. These species lay two to four eggs per clutch, but need at least six adults to feed them.
In contrast, with birds that lay only one egg (seabirds especially) remaining on a nest site with parents is very costly to long-term survival because of competition for food.
A robin lays a small blue round egg. If you have found one on the ground don't pick it up because then the robin won't take care of it. It's important to remember that birds can smell human scent!
One of the only birds that lay blue eggs are Blue Jays, they do not usually lay them on the ground though. There is a very good chance it fell out of a nest.
Some Hens/Chickens , Ostrichs , Eagles, Penguins and other birds.
If you want an ill behaved bird catch a wild one. i will not only be ill-tempered but completely out of control.
Niall never had a bird..... Louis did. And Louis' bird was a pigeon named Kevin :)
The Ostrich lays the heaviest egg. One ostrich egg can weigh up to 7 pounds.
The kiwi is a bird which lays a single egg at a time. It will lay a second egg, but only about 23 days after the first one.
no one lays the biggest egg i go to konini primary school i learn alot there and infact it turns out that the bird that lays the biggest egg is the moa thank you and bye bye
The egg must have had three yolks! -Otherwise known as triplets!
No. A kiwi lays one large egg (about six times the size of an egg from another bird of the same size) then, 24 days later, lays another egg. The second egg is beginning to develop as soon as the first is laid. On rare occasions, a kiwi may lay a third egg. The kiwi can lay only one egg at a time, as the egg is huge - about 15-20% of the kiwi's total body weight.
Once a year, a kiwi lays one large egg that makes up about 15-20% of its body weight, then, 24 days later, lays another egg. The second egg is beginning to develop as soon as the first is laid. On rare occasions, a kiwi may lay a third egg. The kiwi can lay only one egg at a time, as the egg is huge.
A kiwi cannot lay more than one egg in a single sitting. A kiwi lays one large egg (about six times the size of an egg from another bird of the same size) then, 24 days later, lays another egg. The second egg is beginning to develop as soon as the first is laid. On rare occasions, a kiwi may lay a third egg. The kiwi can lay only one egg at a time, as the egg is huge - about 15-20% of the kiwi's total body weight.
A kiwi lays one large egg (about six times the size of an egg from another bird of the same size) then, 24 days later, lays another egg. The second egg is beginning to develop as soon as the first is laid. On rare occasions, a kiwi may lay a third egg. The kiwi can lay only one egg at a time, as the egg is huge - about 15-20% of the kiwi's total body weight.
Survival of hte species. The more eggs a bird lays - the higher the chances that at least one egg will hatch, and grow to be an adult.
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Not necessarily. A kiwi lays one large egg (about six times the size of an egg from another bird of the same size) then, 24 days later, often lays another egg. The second egg is beginning to develop as soon as the first is laid. On rare occasions, a kiwi may lay a third egg. The kiwi can lay only one egg at a time, as the egg is huge - about 15-20% of the kiwi's total body weight.
Kiwi birds usually lay only one egg per season & although the kiwi is roughly the size of a chicken, it lays eggs that are about six times the size of a chicken's egg. Further as Kiwis are not constrained by needing to be able to fly some Brown Kiwi females can carry and lay a single 450 g (16 oz) egg. Once a year, a kiwi lays one large egg that makes up about 15-20% of its body weight, then, 24 days later, lays another egg. The second egg is beginning to develop as soon as the first is laid. On rare occasions, a kiwi may lay a third egg. The kiwi can lay only one egg at a time, as the egg is huge.