Williams Dwarf gecko, Electric Blue Gecko 
Woma Python 
Wrights skink 
Yacare caiman 
Yanez's lava lizard 
Yarará Lancehead 
Yarrows spiny lizard 
Yellow anaconda 
Yellow Bellied Slider 
Yellow-bellied sea snake 
Yellow-bellied Water Skink 
Yellow-blotched Palm Pit Viper 
Yellow-collared Wolf Snake 
Yellow-faced whipsnake 
Yellow-footed tortoise 
Yellow-green Cat Snake 
Yellow-headed gecko 
Yellow-headed water monitor 
Yellow-lipped sea krait 
Yellow-spotted Amazon River Turtle 
Yellow-spotted night lizard 
Yellow-spotted spiny lizard 
Yellow-tailed Indigo Snake 
Yellow-tongued Anole