Splitting from its ancestor, the crested sealyn has made its way to the tropical waters of the Chum Tropical Bay, establishing itself there in huge numbers. Forming large colonies on Sparks Island, their presence has begun to displace the already native species of amphibious onamor, forcing them into smaller and more isolated habitats, as well as further inland. Their presence has also led to a rise in the populations of various scylarians and slaesosauruses as well.
Colonies are dominated by alpha bull males, individuals who are much larger than the other other males by at least half a meter. Their bulky appearance makes them somewhat more vulnerable to predation, though those that survive often rule over harems of females and sire many young. Said young feed on secretions from the mothers in their early weeks of life. Said secretions are produced from pseudo-pouches that formed from the functionless wings of their ancestors, and can be opened and closed at will. Present only in the females, they produce nutritious "milk" that it "sweated" out of the photosynthetic patches of flesh. The young lap this up eagerly in order to put on weight, that way they'll be able to take to the sea at around 2 months of age and begin feeding for themselves.
Other than these morphological differences, this species has not changed that much in terms of behavior compared to the sealyn, though they have now become better adapted to an amphibious existence.