Apparently we are not the only species that is capable of feeling entitled to something that does not always belong to us.
Reporter: Black Mask agreed to talk to us if we do not reveal his identity.
Black Mask, how long have you been acquiring Bob's pebbles?
Black Mask: Let's see. This is my fourth mating season.
Reporter: Are you not worried that you will get caught?
Black Mask: Naaaaah. Look around you, there are 5 million of us. I blend right in.
Reporter: Any reason that you have chosen Bob in particular?
Black Mask: Yeah. He has a good eye for the nicest rocks. Knows just what the ladies like.
Not that sharp though, if you know what I mean...
Reporter: Not really.
Black Mask: Hey Bob. Larry was looking for you. Said he found some really nice pebbles 30 nests down.
Bob: Uukay. Thanks, man. I owe you one.
Reporter: Which one is Larry?
Black Mask: Who is Larry?