Vertebrates, for example, are divided into mammals, birds, reptiles, amphibians and fish. Mammals are warm-blooded animals with hair or fur and can produce milk to feed their young. They have ...

Unlike mammals, birds lay eggs and initial stages of development occur outside the mother’s ... Placenta is not unique to mammals. Certain fish and reptiles have placenta-like connections allowing ...

In a report, the charity says losses in vertebrate species - mammals, fish, birds, amphibians and reptiles - averaged 60% between 1970 and 2014. "Earth is losing biodiversity at a rate seen only ...

Despite its name, the fisher doesn't eat fish or live by the ocean. This shy, plush-furred member of the weasel family inhabits mature forests and munches on everything from birds to small mammals to ...