>Put the chicken in!<
Well, that didn’t work. Chicken was frankly terrified of the guinea. It may have been that individual bird. I may try again, but I’ll do it at night (old chicken introduction trick) so they wake up and see each other.
I’m worried about your Guinea.
The chicken probably thought it was a member of some kind of weird punk rock religious cult, what with that ‘makeup and hairdo’ and all.
Maybe you could try two chickens, instead.
One for the Guinea and the other to settle the other chicken’s nerves.
At least the Guinea would have a flock of some kind to hang out with, even if they aren’t that crazy about him.