Scarlet Macaw parents 'play favorites,' purposefully neglecting younger chicks
Scarlet macaws are a symbol of fidelity and virtue to many people because they are thought to mate for life—but it turns out ...
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Humans' big brains may not be the reason for difficult childbirth, chimp study suggests
Complicated births may not have arisen in humans as a trade-off between our need for big brains and pelvises suitable for ...