There is no such classification. However, monotremes are a sub-classification of mammals, and include the platypus and the echidna. They are egg-laying mammals.
MAMMALS,reptiles,birds,amphibians and fish all have something in common. they have a backbone
They're egg-laying vertebrates with close common ancestors. In cladistic classification systems birds are actually considered a subset of reptiles, as this method of animal classification goes by closest common ancestor.
No. Birds, fish and reptiles are each a classification of "vertebrates" of their own. They all have quite different characteristics.
birds are a whole class in themselves. birds reptiles mammals amphibians fish
Birds, reptiles and fish lay eggs (although not all fish do). The platypus also lays eggs (it resembles a bird but is actually a mammal). animals like birds, fishes and reptiles lay eggs. These animals are collectively called oviparous animals.
Birds are aves, a special branch of the reptiles. Only birds belong to the aves.
penguins are not reptiles but they are not mammals either, they are birds.
Birds are neither mammals, nor reptiles. They are an entirely different branch of evolution. However, they are more closesly related to reptiles, which they descended from. Their evolution from reptiles caused them to resemble mammals.
Birds are... birds. I think there are 4 categories. Mammals, Amphibians, Reptiles, Birds.
Birds are aves, a special branch of the reptiles. Only birds belong to the aves.They are definitely not mammals.
If an animal has bones, it´s a vertebrate. Fish, amphibians, reptiles, birds and mammals are vertebrates. A Jack Russell is a mammal. Hope this helps ;)
mammals,birds,reptiles and amphibians.Any animal with its skeleton inside it.