Mosey Whalevern
This descendant of Rostrocerovenator gigas has improved on its survival by developing a thicker jaw for applying force to kill larger items with ease and by becoming more streamlined in shape for efficient swimming. What is also noticeable is that the tail has thickened, stiffening it for sideways locomotion, and that the back feet have stretched even larger, helping to provide thrust when they push along the water in sync with the tail. It now grows to three meters (3 m) in length due to intraspecific competition, with larger individuals being more successful than smaller individuals of the same species because of the strength that is provided by size advantage.
The Mosey Whalevern (Rostrocerovenator vagarium) has earned its name from the fact that it often spends its time staying near the surface of the water and cruising at a speed of around ten kilometers per hour (10 kph) rather than actively swimming at its top speed of thirty kilometers per hour (30 kph). This is because the behavior helps to conserve energy in its large body because large prey items are not extremely common, and because it does not chase after small food items that dive far under the water, as they are harder to outmaneuver and catch and energy is wasted in the process of doing so, and they do not provide much energy value if even caught.
The Mosey Whalevern's diet consists mainly of slow or unmaneuverable moderately-sized prey with large hitboxes such as Bulimagnathusensis dracokillus, Bulimagnathusensis ostiumdracius, Sword Eel (Dunkleognathusensis geliniensis), Rostrovenator parvus, Spinadraguanga spinagatorus, Terrasuchus gigabetas, Therolamna therophagus, and Valkyriesaurus aquacanthus, which it has a chance to outmaneuver and kill without excess difficulty. It will also take the opportunity to attempt to ambush, catch, and eat smaller wyverns and flying protochyicthids such as Aquadracius tridactylus, Dracowyverious stercorarius, Pneumapiscus glidus, Respirapiscus lunga, Asshole Pelican (Thalassaraptor katharagnathus), and Volantapiscus fugitatus that fly by it or over it. It will speed the pace at which it swims whenever it notices available prey nearby and will lunge its head, neck, and chest out of the water to catch nearby flying items. It will also take the opportunity to scavenge from dead carcasses as they provide an easy source of food, not tolerating other related species such as Rostrocerovenator gigas in order to reduce competition and barely tolerating members of its own species for large floating carcasses such as those of Placviscoslontus flotensis.
Mosey Whaleverns will often stay within thirty kilometers (30 km) of shore as their sources of food are most available in that range, although some may stray further, up to ninety kilometers (90 km), if competition is currently high at the time and they settle for Asshole Pelicans, protochyicthids, and spinagnathids. They will reproduce once a year on average, mature males having orange skin and mature females having silvery skin, while 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. Although Mosey Whaleverns are still capable of giving birth on land, they are awkward at doing so with their large body size and it is tiring for them, so they tend to stick with giving birth in shallow waters. The calf with stick with its mother in the water for approximately seven months (7 mon), learning to hunt and swim before leaving to live on their own. They are usually reproductively mature within one year (1 yr) of being born.
