Fish have babies by either laying eggs or bearing live young. In live birth, the eggs are carried inside the mother until they hatch. She will then give birth to the fry or pups. More »

The most common word for a baby fish is "fry," but other words are used as well. For example, depending on the age of the fish, a young salmon can be referred to by four different names before reaching adulthood. More »

Baby fish are initially called larvae, then fry and finally fingerlings before they mature into adult fish. Larvae are totally dependent on their yolk sac, while fry are able to feed themselves. Fingerlings have function... More »

Armadillos do not lay eggs because they are mammals who give birth to live young. These baby armadillos develop from the same fertilized egg, use the same placenta and number from one to three. This is true except in the... More »

Amphibians and reptiles lay eggs, but recently researchers have discovered that some species of lizards, frogs and snakes abandoned laying eggs to giving birth to live young. A European lizard and a skink species have al... More »

Fish have gills because these organs are used to extract oxygen from the surrounding water in which a fish lives. Gills are different from lungs because gills generally work unidirectionally: water moves in one direction... More »

Animals that lay eggs are known as oviparous animals and include fish, birds, reptiles and insects. These types of animals have little to no other development within the mother. Mammals that lay eggs instead of giving bi... More »