This depends on what kind of animal you’re talking about; boutu are more often called the Amazon river dolphin. They actually don’t lay eggs. They give birth to live young. Many bird species lay between three and six eggs, with some laying more and others laying less. The number of eggs in a nest depends on what kind of bird, and where they live.
Some lay more to increase the chances their young will survive while others lay fewer because they know their young will survive. Back to the Amazon river dolphin. They’re also called the Amazon pink dolphin; the skin of the adult males is particularly dark pink because of how often they bump against other dolphins or other surfaces.