They instinctively seek out water. Many animals in arid areas have a sense of smell that can detect minor traces of water vapor. Where surface water is only seasonal, some hooved animals will pound the ground at a damp location to draw up a pool of water. Other animals have adapted to get most or all of their water from their food.
Sight Sound Temperature Hunger/Thirst
Lions respond to internal stimuli such as hunger by becoming more active and seeking out prey to hunt. Thirst prompts them to locate water sources and drink to quench their thirst. When lions are tired, they typically seek shelter in a safe place to rest and sleep.
energy, life and also no thirst
Feeling of hunger and thirst and the organism could respond by eating or drinking. Or it is any other stimulus that occurs IN side the organism's body.
Animals move to respond to stimuli.
Animals with cephalization respond more quickly and in more complex ways.
yes they do
Tentacles on an octopus respond to touch, while taste buds on the tongue of animals respond to taste.
Planta
Some animals respond to mating calls. If the animal lives in a pack or a herd it might respond to a distress call, like the elephants or a pack of wolves. Some animals respond to visual stimuli, such as the infamous 'chase instinct' found in cats (wild AND domestic) and bears. Some animals respond to their sense of smell, as in the pet dog hangin' around the kitchen at dinner time.
migration and hibernation
surroundings!