What are the most common zoo animals?

It's hard to give an exact list of the "most common" zoo animals because it can vary depending on the size and type of zoo, as well as regional preferences.

However, here are some of the most frequently seen animals in zoos around the world, categorized by type:

Mammals:

* Primates: Gorillas, chimpanzees, orangutans, monkeys (various species)

* Big Cats: Lions, tigers, leopards, jaguars, cheetahs

* Bears: Brown bears, polar bears, black bears

* Elephants: African elephants, Asian elephants

* Giraffes: Giraffes

* Zebras: Grevy's zebra, plains zebra

* Rhinoceroses: White rhinoceros, black rhinoceros, Indian rhinoceros

* Hippopotamus: Hippopotamus

* Other: Wolves, foxes, deer, bison, camels, kangaroos, otters

Birds:

* Raptors: Eagles, hawks, owls, vultures

* Waterfowl: Ducks, geese, swans

* Parrots: Macaws, cockatoos, parrots, cockatiels

* Penguins: Emperor penguin, king penguin, gentoo penguin

* Other: Ostriches, peacocks, cranes, flamingos

Reptiles:

* Crocodilians: Alligators, crocodiles

* Snakes: Pythons, boa constrictors, vipers, cobras

* Lizards: Iguanas, geckos, monitor lizards

* Turtles: Sea turtles, tortoises

Amphibians:

* Frogs: Poison dart frogs, bullfrogs

* Salamanders: Newts, axolotls

Fish:

* Sharks: Great white shark, hammerhead shark, whale shark

* Rays: Manta ray, stingray

* Other: Clownfish, angelfish, goldfish, koi

Invertebrates:

* Insects: Butterflies, moths, beetles

* Other: Spiders, scorpions, snails

It's important to remember that this list is not exhaustive, and many other fascinating animals are found in zoos. Additionally, zoos are constantly working to improve animal welfare and conservation efforts, which may influence the types of animals they choose to house.