Yes they can!
swans
No. But you can get two eggs fertilized at the same time.
Fish are like humans, they (most of the time) give birth (lay an egg-s) once.
A woman does not normally release more than 1-2 eggs at once. The reason for twins is often that these 1-2 eggs might divide into more after they are fertilized. 2 eggs can become triplets or quadruplets or even more. Normally there are fertility medicine at work when a woman release more eggs. Factors at work can also be chemical spills or waste problems that by a freak of nature causes women to release more eggs and sometimes have many babies in one go.
The swan's more than likely won't reject the remaining eggs,& yes,the egg should be replaced if the dogs teeth didn't punchture it.
Yes, a duck can lay eggs more than one a year. I have ducks and chickens that lay eggs daily. (I know that some birds, if their eggs are damaged or ruined in the early stages of nesting, will lay more eggs, most often in a different nest location. Robins and pigeons do it all the time...well, each spring, anyhow). most birds can do it from 1-4 times per year. In the wild, birds lay eggs twice a yr.(House Wrens will build as many nests as they can before the season changes.)
Black swans, which are native to Australia, reach reproductive age at around two years old, but most do not breed until they are 3-4 years old. They breed from February to May in the northern parts of Australia and June to September in the southern regions. After the birds pair (usually for life), the female lays a clutch of around 8 eggs. The eggs are incubated for 40 days and, once hatched, cared for by both parents. Young cygnets are able to fly by the time they are six months old, but tend to stay with their parents until the next year's breeding season. Black swans have a life span of 30 to 40 years.
More than 2500 eggs.
They are larger, more powerful, havier and less aerodynamic than other waterfowl.
It can occur more than once.
if a male swan mates with a female swan she falls preggie than she lays eggs then her eggs hatch and then baby swans come out so a baby swan is a baby of a swan
more than 100