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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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 »

The bee humingbird lays the smallest eggs of any bird on Earth. According to the Guiness Book of World Records, the bee humingbird lays eggs that are 0.275 inches long and weigh only 0.0009 ounces. 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 »

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 »

There is no specified time when chickens stop laying eggs. Female chickens, or hens, lay eggs for the majority of their lives, from about six months of age onward. 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 »