Nocturnal animals are those that are active mainly at night and sleep during the day. The pattern of activity of these animals occurs in twenty-four hour cycles, known as circadian rhythm. Nocturnal animals include bats, cats, owls, mice, scorpions, zarigüeyas, raccoons, coyotes, cockroaches y moths.

Nocturnal animals occupy a niche complementary to that of diurnal animals. For example, owls have a nocturnal role similar to that of hawks during the day. Moths fill the same niche at night as butterflies during the day.

The nocturnal cycle of nocturnal animals is what characterizes them.


Many nocturnal animals have specialized adaptations for their nocturnal activities. The eyes of most nocturnal animals are larger than those of diurnal animals, which helps them work well in low light. Many nocturnal animals have large ears that are exceptionally sensitive. A keen sense of hearing is helpful when sight cannot be relied upon in the dark. Similarly, the keen senses of smell, taste and touch also help overcome the disadvantages of low light conditions.

Most bats have developed a special sonar system called echolocation. They make high-frequency calls either through their mouth or nose and then listen for echoes that bounce off objects in front of them. This is an effective means of finding your way in low light and catching your food (usually insects). Fruit bats, one of the few diurnal bats, lack the ability to echolocate. This shows the evolution of the characteristics that favor their particular niche, in this case daytime activity versus nighttime activity.

Nocturnal animals have a great advantage in survival.

The eyes of cats are well adapted to night activity. The eyes are relatively large, with pupils that can open wide in the dark and narrow down to the openings in the sunlight. The size and position of the eyes on the head allow as much light to enter as possible and ensure a wide field of vision. These are important factors in hunting and night prowling. A cat cannot see in total darkness, but it can see better in dim light than most other animals. Additionally, cats have large, upright ears that aid in detecting prey in the dark.

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List of nocturnal animals

Giant target

giant crave (Tridacna gigas) It is the largest of the mollusks that we know, it can measure up to one meter and weigh up to 230 kilograms, being an immobile animal, it does not move from where it sits and remains in that place the rest of its life in the sea. Therefore we can define it as a wild animal that belongs to the Marine animals.

Sea slug

sea ​​slug (Holothuroidea) o sea ​​slug, Also known as sea ​​cucumber because of their shape and because they hide among the algae, thus looking like just another vegetable. It is a gastropod mollusk marine which, as an adult, lacks a shell and is usually bright in color. The sea slug, or nudibranch, is distributed throughout the world, the most numerous and the largest being those found in tropical waters.

Proteus in underwater cave


El Proteus (Proteus anguinus) is a wild animal belonging to the amphibians totally aquatic as it hunts, feeds, mates and sleeps in underwater limestone caves throughout its life. In the past it was believed to be the baby of a dragon, due to its similar movements and appearances. It is also known as the cave salamander, being the only species of its genus, although it is often called a human fish because its skin tone is very similar to that of humans.

Tree frogs

Tree frogs (Hayla)

The Tree frogs (Hayla) is a genus of amphibians anurans containing about 35 species, belonging to the Hylidae family. The word Hayla It comes from a tree, as these species of frogs spend their lives in trees. They are found living in the forests and jungles of the warmest regions of the world.

Common toad in the forest

Common toad

common toad (Bufo bufo) the European toad es a large amphibian located in Europe. Although it is not found in Iceland, nor in some areas of the Mediterranean. However, it is also possible to find it in Siberia and North Africa.

Fire-bellied toad

Fire-bellied toad

fire-bellied toad (Bombina) is a toad of the Bombina species, belonging to amphibians. Its size ranges from small to medium that it can be found natively in the European continent and North and Central Asia.