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Just after the whale reached sexual maturity, the earplug shows that the animal experienced peak levels of cortisol, a stress hormone. Itテ「ツ€ツ冱 likely that competition with other males triggered high levels of stress in the whale during its first breeding season. The whaleテ「ツ€ツ冱 overall cortisol levels doubled over its lifetime, although the researchers arenテ「ツ€ツ冲 sure what to ascribe this to; it could be due to behavioral factors such as weaning, ecological factors like decreasing food availability, or environmental factors such as intensifying boat noise.