"You couldn't, because the closest pool to us is only open in the summer. Your penguin would suffer heatstroke. You'd have to move to somewhere cold. Like Antarctica. Or Svalbard. And I think they've got a lot of biological regulations on both to not upset the ecosystem."

Why does Steve know all this? Maybe he was looking to retire to Svalbard. It seems nice up there.

"Hold on, John would come with me to fight villains," he counters, as he steps up to the enclosure.

Lions sure do have it easy in captivity, but he also assumes that they are bored out of their minds. They have to have a human to stimulate them, give them puzzles, feed them, clean up their poop. Yeah, Steve couldn't live like that.