Laguz are a strange half-human-half-animal breed. Most call them "sub-humans", which the Laguz consider an insult. Non-Laguz (humans) are called Beorc by the Laguz tounge..

Laguz have special marks branded on their chests. It is black when the Laguz remains in its "human" form. The brand gradually becomes pink. When the whole diamond brand on their chest is pink, the Laguz can transform into its animal form. While in animal form, the brand changes back to black. When fully black, the Laguz transforms back into a human. A Laguz can change back into a human anytime while an animal, and can choose not to change into an animal when the gague is full.

More may be added.

Also, when the Laguz call a human, "human" they are actually mocking them.