It's habitats' (where the animals live)
The direct object is animals. You ask, 'zoologists study what?'; the answer, 'they study animals'.
animals
Zoologists
Zoologists study animals and the biology of animals.
zoologists
Zoologists.
Zoologists study animals.
Zoologists.
Zoologists, whom study zoology specialize in the study of animals.
Zoologists study animal behaviors and watch animals in their native environments. They are often found working at zoos or for the government.
zoologistZoologist are scientist that study animals
Biologists, zoologists, veterinarians and physicians all study animals for various reasons.