[X] Some Slina evolve the ability for their two heads to split apart from and reattach to each other, so that if one half of the Slina is attacked the other half might be able to escape.
[X] Some Slina gained the ability to flatten themselves. This lets them slip through cracks to avoid predators, and glide short distances to allow them to hunt prey that float further out from the ruins, such as Vent Blamps.