I am looking into different evolutionary pathways to sociality in different species; cooperative breeding being one of them.
Sea lions are very social, but do not appear to be cooperative breeders. E.g. " Fostering has only rarely been documented in SSL [34, 38] and female SSL are commonly aggressive towards pups not their own" (Hastings et al, 2017)
Article Natal and breeding philopatry of female Steller sea lions in...
James Des Lauriers
Hello Samuel; I've never read a paper that suggests anything like cooperative behavior among sea lions. Males are utterly oblivious to pups and females either ignore or are hostile to pups other than their own. I'd interpret their social behavior as the antithesis of cooperative. Best regards, Jim Des Lauriers
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