As far as wildlife is concerned, Chris states:
“It spoils the show because it’s simply out of date, some would say barbaric and actually it’s often pretty silly too, because many viewers recognise that the species used are not dangerous, or significantly toxic or venomous in the first place. I’m afraid I can guarantee that some animals are harmed during production, because they are fragile or easily stressed. Or simply killed, as they are in your ‘Bushtucker Trials’.”
Chris explains this further in an article in the latest BBC Wildlife magazine (see below).