The same way that humans do!
A gorilla is an external animal, meaning it has its organs and bodily functions on the outside of the body, like most animals.
spiders
The external structures of animals protect the animal from harm to internal organs. An example of an external structure is the skin and fur on a bear. The skin protects the internal organs, and the fur protects the skin.
The sense organs of animals include eyes for vision, ears for hearing, nostrils for smell, taste buds for taste, and skin for touch. These organs allow animals to perceive and interact with their environment.
external reproductive organs can be distinguished by the 12th week of development
Animals use different types of organs for protection. For instance, the skin is the largest organ of the animals that is generally used to protect the inner parts of the animals.
reproductive organs
All of the organs of a female are internal. I'm not quite sure what you mean about external?
Not all animals that hear have external ears like many mammals do, but many can sense the vibrations that we perceive as sound through other sensory organs, which you might call "ears".
the decropalatran species the rararaestor v
external sex organs
Not all species that are aquatic use external fertalization. Dolphins se internal fertilization but it is very dificult because they would have to evolve adapted sexual organs and i dont think fishes have the right organs for internal fertalizations so they juust eject it into water. I'm not sure this is correct but i hope it helps. You might nneed to check it before you use it in any peices of writing.