What two animals on tap pet hotel do you need for the secret guest quest

I'm not sure..I randomly bought an aquarium room, which unlocks the crab. That's one of the animals, I think, the secret guest unlocks the giraffe(Kenyan trees room) and the two pets to party must be the crab and another animal. It wasn't on purpose trying to unlock the quest, and I couldn't find it on the facebook page too. Good luck trying the combinations!! xD