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4

This is a good question. This type of behavior -- pecking at a branch, wiping the side of the beak on a branch, pulling off twigs and dropping them, or knocking off pieces of bark -- is quite common among many corvid species, particularly when they are interrupted by something or someone that they might consider a threat. This includes not only potential ...


0

To keep it simple: The term here is assortative mating which describes the tendency of individuals to select reproductive partners based on some arbitrary measure of "likeness" considering the available within-species variation. The "likeness" could be anything from a general evaluation to being based on one specific trait. This is a evolutionary ...


5

The answer in extreme brief is yes. Only about 9% of whites and 16% of blacks engage in interracial marriage in the U.S. But really this deserves a fuller discussion. The predominant pattern of mate selection in human beings is to marry within their ethnic group. I say 'ethnic group' rather than 'race' because 'race' has no strong scientific ...


2

Dolphins and orcas do have dialects. Of course there are species specific dialects and it has been shown that orcas reared with bottlenose dolphins tend to learn the latter's dialect. Dolphins of the same species also seem to have regional dialects, as mentioned in this BBC post (I personally do not trust in non-research articles much, but nonetheless in ...



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