Here is some more discarded trivia:
Name the only mammals capable of delivering venom? (Humans do not count).
There are three answers, but two of them are too specific/difficult. Since I don’t want to confuse everyone at trivia night by qualifying that I will accept broad groupings (such as “some dogs” or “some cats” – neither of which is a correct answer, obviously), this question got the boot.
And as always, no cheating.

A carrier pigeon could deliver venom.
They are also aves.
…that I will ACCEPT broad groupings…
These things will happen.
Platypus
platypus and shrews I know, is the third one something shrew-like? Like hedgehogs or moles or something like that?
QI also taught me all about poisonous snakes. Do you know those?