Raiders of the Lost Tomb
These strange shape-shifters live in groups of up to 100 individuals in aeries built in the high canopy. They can be encountered in three forms: lizardfolk, ten feet tall, but missing a tail; pteradons with eight-foot wingspans; and, most unusually, as hybrids between the two-basically, flying lizardfolk. While considered more intelligent than lizardfolk, they are savage adversaries and easily provoked. In pteradon form, they are indistinguishable from their animal-intelligence counterparts.
Pterafolk live in tribes, ruled by a spirit naga. Advice from veterans of Chult is that dying might be a better option than being captured by pterafolk. The pterafolk worship thier ruling spirit naga as a deity, and in turn the spirit naga worships Shekinester, a darker aspect of The World Serpent.