Despite the fact that Las Vegas is located slap bang in the middle of the desert, there is lot of wildlife to be seen on the strip. Granted, not much of it is (if any) is local, but it is worth searching out all the same.
-Flamingos and Friends-
If you are on a budget, head to the Flamingo hotel where you will find a flock of their namesake pink birds amongst other things. You can wander around the gardens of the hotel spotting giant fish, turtles and many other birds and it is quite pretty. There are lots of signs telling you a bit about the creatures you will find and a little bit about them too.
-Lions At MGM Grand-
There are currently two lions living in the enclosure at the MGM Grand and you can walk through a glass tunnel to get a good view. It’s a very busy exhibit so you may have to queue to get to the front. There is also a gift shop nearby where you can get all manner of souvenirs. There is a sign on the front that tells you when the feeding times throughout the day are.
The Secret Garden and Dolphin enclosure at the Mirage Hotel is a tribute to Siegfried and Roy. Even though they no longer perform at the resort, their famous white tigers are still here and form the star attraction at the zoo. It's quite a big zoo and there are some fun animals here including the playful dolphins and it is a nice way to spend a few hours. Entry is around fifteen dollars a person so it's not for those on a budget.
-Sharks and Fish-
If you head up as far as the Mandalay Bay resort you'll find their star exhibit in the Shark Reef aquarium, which is probably not worth the entrance fee unless you are specifically interested in aquariums. A much better bet is the huge aquarium at the end of the Forum Shops in Caesar's Palace, which is free to observe and has some pretty big fish in it.