The swimmer janit split from its ancestor and moved to the western beaches of Dixon, where it has learned how to swim. It has developed an air sack just below its head in which it can store just enough air to stay underwater for about half an hour. Its legs have developed oar-like appendages for more efficient propelling. It can reach great speeds, when swimming as well as when crawling on the beach. It still reproduces in much the same way as its ancestor. Eggs are laid in small heaps in the surf. The young don't have fully developed air sacks yet, so they will remain on the beach until they grow up. Young swimmer janits will stay closely together in large groups, though adults are more solitary.