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In songbirds, by contrast, both the male and female can contribute equally to the very important job of incubating and protecting the egg. The most like strategy of investment by bird parents to evolve is probably both parents caring for the offspring, probably taking turns at the nest, and bringing food back to the chick.
As with Chinese male humans, having your own building is still vital to raising young. One of the established ways to evaluate self-cognition in animals (including humans) is the mirror test. In the classic test, an animal is anesthetized and then marked on an area of the body the animal cannot normally see. ” ( source ).
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