Following up on the Bronze Age tour of the fortress of solitude, here are the silver age debuts of some of Superman's weirder living trophies from that post.
Apparently, by the Bronze Age Superman had named this adorable, yet dangerous little guy the 'bravado beast'. He'd also quit calling it his pet and started keeping it locked in a tiny glass cage with all the others, and would "just as soon donate [it] elsewhere". Which is hopefully not a euphemism.
The Martian dancing plant being an extra-galactic spore is new information, just like the Venus butterfly being from Betelgeuse.
I don't know why Superman didn't include the lightless flower from the dark world in his tour down memory lane; he included just about everything else alive from these issues. Perhaps something terrible has happened to it? (Probably Lois. She just wanted to see what it *looks* like...)
And suddenly, Supergirl changed outfits at super-speed to green.