From Equestripedia, the Archives of Equestria!
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Lizards at the Animal Shelter

Lizards were a broad type of reptile that made for popular pets, but lizards could also be predatory and dangerous. Like other animals however, lizards were capable of feeling love, as Ray loved Sunset Shimmer, but most lizards who popped up appeared aggressive, such as the one that nearly attacked Fluttershy and Twilight Sparkle when they fell down an Oubliette.