Remucauda subsalis
When Bulbus salmacidus began to grow in the brackish waters of Zone 10, some members of Castorocauda subaquatica travelled there as well in order to feast on those polyphs without being stopped by any competition. They gradually adapted to the new environment and became a new separate species, Castorocauda subsalis.
Castorocauda subsalis looks and behaves similarly to its ancestor and is twenty centimeters (20 cm) in length, but has thicker skin that protects it from salt which makes its trademark pattern appear more pale in color. Although the bays are generally calmer and there is less of a risk of running into rocks, Castorocauda subsalis kept the end of the beak on the forehead as it provided additional support to the beak while nipping off pieces from the bulbs and stem. A drawback to living in the brackish waters, however, is that the kidneys have to work faster and harder to be able to filter out the excess salt taken in, and thus food has to be constantly eaten to fill its demands of energy.
Castorocauda subsalis is mature at nine (9) weeks of age and will crawl approximately forty meters (40 m) from the shoreline to reproduce and lay their eggs.Females will lay anywhere between fifteen (15) and twenty-five (25) eggs and bury them underneath the sediment. Reproduction will repeat every nine (9) to ten (10) weeks to sync up with the newer generations, although females will usually have all of their eggs produced and ready by the sixth (6th) week.
Castorocauda subsalis still retains a reflex that makes them dormant and slows their systems down whenever the air temperature drops below the twelve-degrees Celsius (12°C) mark and hibernate forty meters (40 m) away from the shore on land underneath the soil for more gradual heat change (to reduce cold shock) and to lose less energy while food isn't as abundant. For this reason they stay where they can see the shore or a landmass, so they know where to go to hibernate so that they do not end up accidentally drowning.