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Humans and chimpanzees recently evolved a more active fight-or-flight response compared to other primates, possibly in response to the threat of warfare.
A new study shows that when feather replacement and parental care overlap in time, migratory songbirds make a striking trade-off; they desert their offspring, leaving their mates to provide all remaining parental care.
Baby birds go missing from their nests all the time. Usually, the disappearances are chalked up to predation, but in extremely rare cases, parents have been observed removing their own chicks from their nests. In a new study, the mysterious and fatal behavior is documented in dickcissels for the first time.
