Living being have gone a process of natural selection for million of years, in which those with characteristics are the one that survives. So, is emotion vital for survival, apparently yes, specially with mammals and birds.
Mammal mothers let the young suckle on their body, the youngters in return feel a desire to bond and stay near them.
In the wild mammals that fail to bond with their mothers rarely survive for long. It is evident that love among mother -infant is required for all mammals.
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With that result we can say that mammals can't live with food alone. They have emotional needs to. Evolution imprinted them with the assumption that emotional needs are formed with soft furry things than with hard metallic objects. Alas, the cloth-mother never respond to their affection thus they grew up to be neurotic and asocial adults.
With these experiments done, animals have emotional needs should be addressed, but I don't see that happening with the billions of animals in dairy industries.
In 1950s and 1960s, Harry Harlow conducted an experiment on infant monkeys separated from their mothers after birth. When given a choice between a metal dummy-mother fitted with milk bottles, and a soft cloth-covered dummy with no milk, the babby monkeys clung to the barren mother for all they are worth.
Freudian theories argued that relationship between children and parents were shaped by material feedback; children needed food, shelter, and medical care, so they bonded with their parents because they provide these needs.
Diprotodon is an extinct genus of gigantic quadrupedal marsupial native to Australia during the Pleistocene epoch. Diprotodon meaning in Greek "two forward teeth". The genus is currently considered monotypic, containing only Diprotodon optatum, the largest known marsupial to have ever existed
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