Yes
they give birth to live young and produce milk
The first A in mammal has a short A sound, the second has a schwa, or unstressed sound (mah-mull).
no cause whales do no feed milk to their youngs
The Australian echidna, or spiny anteater, shares this same characteristic.
It is a sound that frogs make when communicating with one another.
The main characteristic that will guarantee if the Angora Rabbit is a mammal, is if the female produces milk. if not, it isn't one.
vibrations
frequency is the pitch of a sound
The main characteristic of a monotreme is that it is an egg-laying mammal, unlike marsupials and placental mammals which give birth to live young.
Do You make sound when YOU exhale?. You are a mammal.
Communicating in their own ways.
Mammals make milk to feed their young. It is a defining characteristic of the mammal grouping.