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Crepuscular, a classification of animals that are active primarily during twilight, making them similar to nocturnal animals. Diurnality, plant or animal behavior characterized by activity during the day and sleeping at night. Cathemeral, a classification of organisms with sporadic and random intervals of activity during the day or night.
The term "eel" is also used for some other eel-shaped fish, such as electric eels (genus Electrophorus), swamp eels (order Synbranchiformes), and deep-sea spiny eels (family Notacanthidae). However, these other clades , with the exception of deep-sea spiny eels, whose order Notacanthiformes is the sister clade to true eels, evolved their eel ...
Arctic tundra is the northernmost (and coldest) of European habitats, in extreme northern Scandinavia, Svalbard archipelago, northernmost part of Russia. Some typical animals include reindeer, Arctic fox, brown bear, ermine, lemmings, partridges, snowy owl and many insects. Most tundra animals undergo hibernation during the colder season.
The wildlife of Iceland is the wild plant and animal life found on the island of Iceland, located in the north Atlantic Ocean just south of the Arctic Circle. The flora, fauna, and funga is limited by the geography and climate of the island. The habitats on the island include high mountains, lava fields, tundras, rivers, lakes and a coastal ...
Within the same laboratory populations of goldfish, some individuals may be spontaneously diurnal while others are nocturnal. [43] Goldfish can also be diurnal if food is more available by day, or nocturnal if food is available at night. [44] Salmon are mostly diurnal when temperature is high, but become more nocturnal if temperature plummets. [45]
The snowy owl (Bubo scandiacus), [4] also known as the polar owl, the white owl and the Arctic owl, [5] is a large, white owl of the true owl family. [6] Snowy owls are native to the Arctic regions of both North America and the Palearctic, breeding mostly on the tundra. [2]
Found almost exclusively in fresh water (the only exceptions are species that occasionally may visit brackish water to feed), these mostly nocturnal fish are capable of producing electric fields to detect prey, for navigation, communication, and, in the case of the electric eel (Electrophorus electricus), attack and defense. [2]
Ambient temperature has been shown to affect and even convert nocturnal animals to diurnality as it is a way for them to conserve metabolic energy. [ 10 ] [ 1 ] Nocturnal animals are often energetically challenged due to being most active in the nighttime when ambient temperatures are lower than through the day, and so they lose a lot of energy ...