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What are Animals and What are Aliens? Examines the definition of animals, from the historical definitions derived from observation (e.g. Aristotle), to modern phylogenetic relationships. The book argues that a purely phylogenetic definition of what is an animal cannot be sufficient for classifying alien life. 4.
Alien pathogens could decimate the human population, which would have no immunity to them, or they might use terrestrial livestock or plants as hosts, causing indirect harm to humans. [45] Invasive organisms brought by extraterrestrial civilizations could cause great ecological harm because of the terrestrial biosphere's lack of defenses ...
As for the possible risks, theoretical physicist Stephen Hawking warned in 2010 that humans should not try to contact alien life forms. He warned that aliens might pillage Earth for resources. "If aliens visit us, the outcome would be much as when Columbus landed in America, which didn't turn out well for the Native Americans", he said. [158]
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Cryptozoological animals and cryptobotanical plants, including those from folklore, religion (e.g. golem), mythology (e.g. dwarf (see also dwarfism); giants from Atlantis (see also gigantism), etc.), and some reports of ghosts, poltergeists, and time travellers (alleged) Mothman (see also American folklore) Jersey Devil; Loch Ness Monster ...
The existence of extraterrestrial life is a scientific idea that has been debated for centuries. Initially, the question was purely speculative; in modern times a limited amount of scientific evidence provides some answers.
Humanoids may also include human-animal hybrids (where each cell has partly human and partly animal genetic contents) and human-animal chimeras (where some cells are human and some cells are animal in origin). [2] Science fiction media frequently present sentient extraterrestrial lifeforms as humanoid as a byproduct of convergent evolution.
Intelligence is, along with the more precise concept of sapience, used to describe extraterrestrial life with similar cognitive abilities as humans. Another interchangeable term is sophoncy, being wise or wiser, first coined by Karen Anderson and published in the 1966 works by her husband Poul Anderson.