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They have live babies and mammals usually have fur while birds, fish, and reptiles do not. ------------------------------------------------------------ Another answer would be the reproduction of Milk (Mammary Glands) but there is one exemption to this because the Platypus is know to lay eggs (which is a bird-like characteristic) and breast feed when the young hatches.
What else can I help you with?
A distinguishing feature of all mammals?
All mammals feed their young with milk, have hair, have a neocortex region of the brain, and have three middle ear bones. There are other characteristics shared by all mammals, but the above four are (for the most part) that only ones unique to mammals.
What were some of the first mammals on earth?
The first mammals may have been Adelobasileus, a genus of extinct mammals about 225 million years ago. They may or may not have had mammary glands (the defining feature of a modern mammal). Their only record is a partial skull found in western Texas.
What skeletal feature that is present in birds and mammals is lacking in frogs?
Ribs
Why teats are only in mammals?
Only mammals nurse their babies.
In placental mammals is a baby nourished with milk after birth?
Yes. This is a feature of all mammals, and if this did not occur, the animal would not be classified as a mammal.
What key morphological feature is used to classify organism's as mammals?
Mammalae, or breasts.
Which key morphology feature is used to classify organisms as mammals?
mammary glands
Do non mammal vertebrates have hair?
Mammals are the only animals that have true hair. This feature is what sets them apart from other animals.
Do snakes feed young their young with milk?
where would it get the milk? A snake is a reptile, so its yong are on their ow and eat meat from the begining. In other words, No.
Are birds the only mammals with feathers?
No. Birds are not mammals.
What are herbivorus mammals?
They are mammals that only eat plants.
What reproductive feature is common to mammals?
Sexual reproduction by union of male and female gamets.
