Less obvious to most humans is olfactory communication.

Its olfactory communication is the marking of a scent from the circumoral gland which the female uses to mark her mate with the gland located around the mouth.

Urine marking is the best-studied means of olfactory communication in wolves.

Both sexes have chest glands which are used in olfactory communication.

This fact, along with the observation of rub-urination behavior in this animal (at least in the male) indicates that urine probably plays a role in olfactory communication in deer.

His work covers different areas, including administration (which he calls Artministration), postal and olfactory communication.

As with all prosimian primates, olfactory communication is used extensively by ruffed lemurs - scent marking in territorial defense and disputes, as well as female greeting displays.

Woolly monkeys have an elaborate system of vocalization and olfactory, visual and tactile communication.

Both sexes have a sternal gland, which might be involved in olfactory communication, especially during mating, when the female encourages the male to mate by releasing an attractive scent.

In addition to noises, the rhino uses olfactory communication.