A dolphin is a mammal because they breath air just like humans
The ostrich is a bird, a flightless bird.
It's a bird - the clue is in the name !
Turkeys are birds (meaning they have feathers, beaks, etc.).
arachnids, arthropods etc all animal are invertebrates unless if they are a mammal, reptile, bird, amphibians or fish
Amphibians of course!
Depends....How big/small? how much does it weigh? Fragile such as a microscopic organism? Is it a plant, mammal, reptile, bird, etc. An organism is any living thing :p
Jellyfish are cnidarians.
dolphin's, whales, etc. manaties, seals and walrus are also marine mammals.
It has hair as a body covering as it is a mammal.
i am not really sure but it is not a mammal or an amphiibian .MAYBE IT IS A FISH
A mammal is an animal which is warm-blooded, and gives birth to live babies (With an exception to some animals). For Example: Dolphins, whales, wolfs, bears, lions, tigers, etc. A reptile is cold blooded and lay eggs, for example: Snake, lizzard, turtle, crocodile, etc.
A reindeer is a mammal, in that the female feeds its young through mammary glands. Amphibians are animals such as frogs and salamanders whose larvae are born in the water and breath through gills which they lose in adulthood, to then breath through lungs.