Botanists study plants. Zoologists study animals. Ornithologists study birds. Herpetologists study snakes and frogs. Entomologists study bugs.
Ichthyologists study fish.
Fish and wildlife biologists study and manage the wildlife, especially game species for hunters and fishermen. At a Nursery. In a hospital a nursery is where new babies stay until they go home with their parents. People who work in nurseries grow new trees, shrubs and other plants. Trees start from seeds grown in seedbeds, sometimes in a special glass house called a greenhouse.