All birds lay eggs; of the 9,000 species of birds, none of them give live birth. Instead, birds form and lay eggs that are incubated outside the body. Eggs range in size depending on the bird and can be as small as 0.2 g... More »

All three species of bluebirds – eastern, mountain and western – lay blue eggs. The blue eggs may have white streaks that resemble scratches, which may stem from urine or fecal stains, or when the female turns the eggs. More »

All dinosaurs laid eggs, which were fertilized through sexual reproduction between a male and a female. There is evidence that some species of dinosaurs cared for their young during incubation and after hatching. 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 »

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 »

Female birds turn the end of the oviduct inside-out to lay an egg and allow the egg to emerge. A bird currently laying an egg can be identified by a rhythmic moving and opening and closing of the bill, though time varies... More »

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In the United States, frogs normally lay eggs in the spring. In warmer climates, such as Australia, frogs lay eggs more often. In North America, during spring months, the female frog releases her eggs into the water. The... More »

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