It is highly unlikely that Lily is a lion. It is unlikely that Greg is a frog. There is a better than even chance that Brian is gray.
It is improbable that brian is gray, or Greg is a frog.
It is probably the case that brian is gray, or Greg is a frog.
It is improbable that brian is gray, or Greg is a frog.
Brian is gray, or Greg is a frog.