In mammals, pair bonds are very rare, one of the few exceptions being red titi monkeys. Researchers have now investigated how pair relationships work in titi monkeys. Their results support the 'male-services hypothesis': Males provide a useful service by taking more care of the offspring and defending the territory against intruders, while females are more involved in relationship management and, for example, seek the proximity of their partner more often.
from Latest Science News -- ScienceDaily https://ift.tt/389vsDk
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