Hacking in to release the animals, not quite sure why the farm has their paddocks connected to the Internet but they’ll learn that it’s a bad idea soon enough 
Farm (4-6 letters)
- Sheep
- Goat
- Donkey
- Horse
- Goose
Zoo (6-10 letters)
- Giraffe
- Rhinoceros
- Elephant
- Meerkat
- Orangutan
Jurassic park (10+)
- Velociraptor
- Dilophosaurus
- Triceratops
- Tyrannosaurus
- Pterodactyl