Atrovenator gigas
Nesting Site: Low-slope sandy shorelines of Zone F
Hunting Site: Open oceans of Zone 3, no further than thirty meters (30 m) in depth
A descendant of Rostrovenator letaligibbas, Rostrovenator gigas has grown up to two-and-a-half meters (2.5 m) in length as a response to more and more organisms entering the zone from land. Rostrovenator gigas is mostly solitary except for raising young and mainly hunts schooling creatures in the water such as Communoslontus populator and Suboslontus communis. They do not hunt lone "small fish," but will go out of their way to hunt Spinagnathusensis dracokillus, Spinagnathusensis ostiumdracius, Aquadracius thalassomoloch, Aquadracius neofoundus, Aquadracius tridactylus, Pelecanimimus unculodon, Rostrovenator rostrus, Rostrovenator parvus, Dracuanguilacerta aquacanthus, and Terrasuchus gigabetas that are in the water.
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Rostrovenator gigas does not keep territories but will not tolerate other creatures feeding on carcasses and will chase them off to claim the meat for their own. They do not actively hunt Gigaslontus flotensis but will scavenge off of dead Gigaslontus flotensis. In the case of two or more individuals feeding on a large carcass, they may share less valuable parts (flesh from the back and limbs) but the "dominant" feeder has access to more valuable parts such as the stomach and liver with more nutrients. The "dominant" feeder is usually the largest member that intimidates the others into giving it access to food, so they do not risk their lives fighting. Bones are not consumed, but only the meat around them.
Males of the species have orange skin while females have silvery skin.Like in Rostrovenator letaligibbas, the young have white feathers and dullish-tan skin. The mature individuals may have patches or specks within their feathers, caused by uneven patterning that helps to break their body shape while hunting underwater, during which they can hold their breath for up to ten (10) minutes before having to resurface. The air sac is covered by layers of skin and tissue and extends over the top of the snout before no longer being visible. The webbing of the feet extends to the edges of the toes and helps to push the body along while also swimming with the tail side-to-side.
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Females will carry a single egg in their oxygenated womb for approximately six (6) months before the fetus hatches, consumes the shell, and the mother gives birth on the nearest available shoreline. Twins do occur in rare cases, but having a single calf is much easier to watch over and manage. The calf will usually molt and leave its mother within thirty (30) weeks of age when it is mature but will slowly grow for another five years. They are typically able to reproduce by the time they reach one (1) year of age.