People can create amazing pictures on Photoshop by combining different animal pictures together. The article I found on Petapixel describes these creations as Chimeras. A Chimera originally referred to the mythological Greek animal combination of a lion, goat and snake (usually portrayed as a lion with goat head on its back and a snake tail). Now the term Chimera can be used to refer to any imaginary creature created using two or more animal pictures.
Here is an example of the original Chimera:
Bronze Chimera of Arezzo, in Museo Archeologico Nazionale in Florence.
Here are some examples of modern Photoshopped Chimeras:
Guinea Pig + Horse
Whale + Penguin
Duck + Horse
Guinea Pig + Lion
All of these photos are examples are from Petapixel. Click the link to see more photos and read a short tutorial about the process if you want to create your own Chimeras.
I really want to start looking for appropriately colored and posed animal photos to try and create my own examples!