Yes, nature is often full of surprises! And although we have always learned that mammals are viviparous, that is to say that their eggs develop inside a maternal uterus, and that they give birth ...

The platypus is a mammal that lives in Australia on land and in rivers. Platypuses are one of the few mammals that lay eggs. Aquatic – Any animal that lives or feeds in water. Seals, dolphins ...

The weird creatures have a duck's beak, venomous feet and are one of only two mammals able to lay eggs. Australian scientists discovered in 2010 that the semi-aquatic animal's milk contains a ...

Both usually produce few young at one time, and ensure their survival by caring for them. Unlike mammals, birds lay eggs and initial stages of development occur outside the mother’s body. Reproductive ...