They are kind of like the UK equivalent of a hornworm since they are so big and need to eat an artificial diet. If they were easy to buy here in the US, I would buy them/breed them. They are very easy to breed and keep (I've had them before, but I couldn't find a source for an artificial diet and didn't have the resources to make one at the time so I stopped breeding them, even though the moths are giant and beautiful.) They would be great to add variety and to add a nice large worm for them to eat.