Small-Armed Mosey Whalevern
This descendant of Mosey Whalevern (Rostrovenator vagarium) has adapted more for an aquatic lifestyle. The most notable feature of the Small-Armed Mosey Whalevern (Rostrocerovenator micropinna) are the reduction of forelimb size, which has resulted because it prioritizes the back fins for its steering and propulsion, and does not use the forelimbs much. The back fins have stopped forming the keratin sheaths of claws, because they no longer go on land to birth. It remains at three meters (3 m) in length as its food sources have not grown much larger in size and is still capable of fending off its competitors at this size.
Like its ancestor, the Small-Armed Mosey Whalevern cruises near the surface of the water at a relaxed pace of ten kilometers per hour (10 kph). It can swim up to a top speed of thirty kilometers per hour (30 kph), but it prefers not to because of the higher energy expenditure. The large food sources it seeks are not extremely common so it may have to travel a large distance.
The Small-Armed Mosey Whalevern's preferred prey consist of Cow Shark (Ruminasqualus unguladontus), Draco chadensis, Rostrovenator parvus, Spinadraguanga spinagatorus, Terrasuchus gigabetas, Therolamna therophagus, and Valkyriesaurus aquacanthus. It will also take opportunities to ambush and eat flying prey such as smaller wyverns and flying protochyicthids like Respirapiscus lunga and Volantapiscus fugitatus that fly too close to it.
It will swim more quickly when available prey is nearby and will lunge its upper body out of the water to catch flying muscals. It will also scavenge from dead carcasses as they provide an easy source of food and do not require any chase or struggle. Small-Armed Mosey Whaleverns are territorial of their kills and usually do not tolerate smaller competitor species such as Rostrocerovenator gigas that want to share the food. They may tolerate members of their own species or species of similar size like Mosey Whaleverns when feasting on large floating carcasses such as those of their own species and the occasional Placviscoslontus hypobacterius carrion if it is to drift far enough.
Their immune system has developed to fend off possible infections of Wyvern Plague (Ventricapillus hemolaimus) that can be transferred from consuming kills. It will develop the antibodies for fighting off Wyvern Plague as soon as the presence of it is detected. This reduces the risk of death.
Small-Armed Mosey Whaleverns are no longer obligated to stay within thirty kilometers (30 km) of shore as that is where food used to be most abundant but many of their land-tied prey items have since become extinct. Some Small-Armed Mosey Whaleverns that are weak may still linger near shore in hopes that an unfortunate muscal falls in.
Small-Armed Mosey Whaleverns will reproduce once a year on average.
Mature males have orange skin, mature females have silvery skin, and calves have peach-colored skin. The female carries the egg for six months (6 mon) until the single calf hatches, eats the surrounding eggshell for calcium, and the mother finally gives birth in shallow waters between three and seven meters (3-7 m) deep, in places like underwater sandbars, beaches, or lagoons so she can assist the calf with swimming up to breathe while avoiding the risk of becoming beached. The calf will stick with its mother for seven months (7 mon), learning to hunt and swim before leaving to live on its own. Small-Armed Whaleverns are usually reproductively mature within one year (1 yr) of being born.
