The platypus is considered to be a primitive mammal which still has some reptilian characteristics, but it does have fur, and it does secrete milk to feed its offspring, and those are key mammalian characteristics that no reptile has.
Correction:
In recent decades, scientists have debunked the theory that platypuses and their egg-laying relatives, echidnas, are primitive. Egg-laying mammals are called monotremes, and it is no longer believed that monotremes are primitive mammals.
No. A crocodile is an egg-laying reptile. A platypus is an egg-laying mammal.
A platypus is a monotreme, which is an egg-laying mammal.
Platypuses are monotremes, or egg-laying mammals.
The platypus is not a reptile - it is an egg-laying mammal.
No. A platypus is not a placental mammal of any type, but a monotreme, which is an egg-laying mammal.
The platypus and the echidna are egg laying mammals. Egg-laying mammals are known as monotremes.
Monotremata or egg-laying mammal.
The platypus is a mammal. Specifically, it is a monotreme, which is an egg-laying mammal. It belongs to the family ornithorhynchidae.
A platypus is an egg laying mammal, or monotreme. Its actual species name is Ornithorhynchus anatinus.
No. The whale is a placental marine mammal; the platypus is a semi-aquatic monotreme, or egg-laying mammal.
The platypus is a protected Australian native monotreme, or egg-laying mammal.
The echidna is a monotreme. It is an egg-laying mammal.