At the aquarium inside the Silverton Hotel on weekends you can even catch mermaid shows in which costumed underwater performers swim alongside the fish. Las Vegas has no zoo, but hardly needs one: We gaped at live flamingos inside the Flamingo Hotel's wildlife habitat visited white tigers, leopards, and dolphins at Siegfried & Roy's Secret Garden and Dolphin Habitat and peered at piranha and rare golden crocodiles at Shark Reef Aquarium.