Nom Nom Nom
It’s a survival instinct. They don’t want to wait around and eat in places the predators could be lurking, so they do something interesting … and annoying.
The grab anything they can get their claws on, drag it back to their home, and then test if they can eat it! If they can’t, they cast it aside. And, if you think a house on Christmas Island is safe from these guys, you’re wrong!