Reptile Mod 1.10.2, 1.9.4, 1.9 will now spawn in all suitable biomes that are derived from the BiomeGenBase class. This means reptiles will spawn in biomes from the ExtraBiomesXL mod. Reptiles will not spawn in cold biomes, or the Nether or the End.
Install Reptile Mod:
THis mod requires Forge installed first, then just copy the mod jar files to the mods directory in your minecraft directory.
jarsigner -verify <JAR file> in the terminal or command line, where JAR file is the path and name of the mod jar to verify.