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The narwhal was scientifically described by Carl Linnaeus in his 1758 publication Systema Naturae. [5] The word "narwhal" comes from the Old Norse nárhval, meaning 'corpse-whale', which possibly refers to the animal's grey, mottled skin and its habit of remaining motionless when at the water's surface, a behaviour known as "logging" that usually happens in the summer.
In the previous 11,000 years, humans have brought a wide range of species into domestication to use as livestock, working animals, household pets, and companions. [27] The influence of human behaviour on domesticated animals has led to many species having learned to co-exist - sometimes leading to the formation of an interspecies friendship.
This recruitment of natural enemies functions to protect against excessive herbivory and is considered an indirect plant defense mechanism. [3] Traits attractive to natural enemies can be physical, as in the cases of domatia and nectaries ; [ 1 ] or chemical, as in the case of induced plant volatile chemicals that help natural enemies pinpoint ...
The sperm whale has a particularly pronounced melon; this is called the spermaceti organ and contains the eponymous spermaceti, hence the name "sperm whale". Even the long tusk of the narwhal is a vice-formed tooth. In many toothed whales, the depression in their skull is due to the formation of a large melon and multiple, asymmetric air bags.
Surviving in the wild is no easy feat, but thanks to evolution, many animals evade their predators with a clever deception of the eyes. Since the beginning of time animals have either adapted or ...
Mimicry is a resemblance of one species to another which protects one or both species. The resemblance can be in visual appearance, behaviour, sound, and scent. There are many types, which can be combined. [5] Defensive or protective mimicry enables organisms to avoid harmful encounters by appearing to their enemies to be something that they ...
Mobbing is the harassing of a predator by many prey animals. Mobbing is usually done to protect the young in social colonies. For example, red colobus monkeys exhibit mobbing when threatened by chimpanzees, a common predator. The male red colobus monkeys group together and place themselves between predators and the group's females and juveniles.
Historian David Reynolds on what Winston Churchill really thought about Hitler, Stalin and other enemies.