Dad & Son Lions www.blackpoolzoo.org.uk/ node/1149
This isn't the first time a zoo Dad has 'stepped up' when Mom passed away. It happened in the Central Park Zoo several years ago with Red Pandas. That really surprised the keepers as that species dads are not involved with rearing the kids at all in the wild.
My older cats have taken over care of younger cats/kittens I've brought in. As Smokey did with Fuzzy. Sometimes he gets that 'just give me some peace' exasperated parent look when Fuzzy gets too 'needy'. But he usually just needs a nap & then he's back spoiling Fuzzy.