You have chosen a career to follow and prepare for, now it’s time to learn more about the species (and breeds) you will work with. 

Read about the basic facts and join the Critters Group to learn even more about them, as well as how to work with them, and how to gain experience if you want to work with them. If you are not a member, join us in the OZT Community!

Definition of a Critter

The term “critter” is not part of the scientific taxonomy of species. But there are many small animals that have been tamed (and to some degree domesticated) by humans as pets.

The One Zoo Tree meaning of critter is therefore a living creature that many have as pets, either fully or partially domesticated or sufficiently tamed to stay with humans.

The way we work with critters is in many ways completely different than what we would if we found each of these species in the wild.

NB! Most of the species listed as critters can still be found in the wild.

List of different Critters

We currently have 8 different species, domesticated enough to be classified as Critters:

  • ^ Chinchilla
  • ^ Ferret
  • ^ Gerbil
  • ^ Guinea Pig
  • ^ Hamster
  • ^ Pigeon
  • ^ Rabbit
  • ^ Silkworm

If you want to contribute to the information on this Page, please click on the red beetle!

OZT Community Logo

Join the Critters Group

Status: Active

Learn even more about Critters by joining the CRITTERS GROUP.

Members of the Group can create and discuss any critter related topic, as well as gain access to all the different Short Courses, win awards and meet other critter lovers from around the world. Gain experience points with each short course and compete for the top spot on the leader board!

Topics covered in the CRITTERS GROUP:

  • ^ General critter knowledge (Anatomy, Habitat, Behaviour, Diet, Ecological Benefits & Conservation)
  • ^ Critter Care & Health
  • ^ Creative (Including education, art, design, publishing, media, news and photography)
  • ^ Species & Breeds (courses on over 20 different breeds)


This is also the place where you will find links to all of the Animal Organizations that work with critters. Join their special Groups and learn how you can gain valuable experience by volunteering or interning with them.

Profiles and Additional Resources

Contributions by expert members are always appreciated to allow the students to make informed decisions. Please add your contribution through the attached form:

Contribution Form

List of Species Mentors/Educators who have contributed to the info:


One Zoo Tree

A few good pictures and photos of the different critter species: