Horse
Homoeostasis.
Hippopotamus.
It shivers (to heat up), and sweats (to cool off).
Evaporative cooling. As the perspiration evaporates it cools the body of the animal.
No animal truly sweats from its tongue, but some animals do pant to cool themselves in place of sweating. One animal that is known for this is a dog.
It sweats to cool your body off. The sweat prevents your body from overheating.
Homeostasis
The sweat evaporates and cools the skin.
The process of evaporation helps cool your body when it sweats. As sweat evaporates from your skin, it takes heat with it, helping to lower your body temperature.
When your body sweats, the process of evaporation is working to cool your body off. Sweat is produced by your sweat glands in response to an increase in body temperature. As the sweat evaporates from your skin, it absorbs heat, thus helping to lower your body temperature.
It sweats.