The saying “Birds of a feather flock together” is being given new meaning by a study published in the Philosophical Transactions of the Royal Society B. Flocking birds often travel in groups made up of a single species, in which individuals are nearly indistinguishable from one another, as noted by the proverbial adage. But something strange happens in flocks of two or more species from Southeast Asia. Even when flock species are distantly related, they still seem to converge on the same appearance, as if trying to fit in.
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Source: Phys.org