Pygmies are a specific morphology known for their small size, and are only able to breed with other Pygmies and Pumpkin Dragons. Most of these dragons on Dragon Cave will have "Pygmy" in their name somewhere. Pygmy eggs cannot be bitten by Vampire Dragons due to their size.
On August 20, 2017, a site update was done that involved new descriptive text for this morphology type being added into the cave. This text was added in addition to what regular dragons include on their pages, describing what dragons are in the context of the Dragon Cave world, with this next text being added after this standard description.