Evidence for vocal learning in juvenile male killer whales, (Orcinus orca), from an adventitious cross-socializing experiment. (sciencenews.org)
Starting with juvenile male rats, which tend to be most playful, he spends a week or two letting them get used to being tickled on the back and belly. (sciencemag.org)
Old fears that castration of juvenile male cats would predispose to urinary obstruction were disproven in the 90s. (felinefixbyfive.org)