Savannah grassbag (SciiFii)

The savannah grassbag (Neotitanosaurus zimbrabus) is a species of non-avian titanosaur sauropod dinosaur, closely related to the similarly-looking bandersnatch grassbag (Neotitanosaurus halletti), that originally did not exist, but has since been created by SciiFii and introduced throughout the open woodlands, grasslands, shrublands, and scrublands across Sub-Saharan Africa to help boost biodiversity. The savannah grassbag is a very large sauropod, with the largest specimens growing to be about 23.7 meters (77.7 feet) from snout to tail-tip and exceeds the 30 ton-mark when fully laden with fat reserves. Such titans are rare, however, with the majority of adults in the 14 to 18 meters (45.9-59 feet) and a 12-20 ton range. Reaching sexual maturity at only nine meters, no other dinosaur (avian and non-avian) has such a size-disparity between breeding individuals of the same population. A healthy adult has no natural enemies, but may still succumb to fire, drought and intraspecific combat. Like other sauropods, savannah grassbags lack molars and do not chew their food. Instead, they pass the grass (and unfortunate insects such as beetle grubs) directly into their enormous crops, where rocks the size of a man's fist grind the high-silicate plant material into an easily digestible paste which then pass into an incredibly long gut. Once the sauropod has extracted what nutrients it can from it, the vegetable mix then encounters yet another remarkable example of the symbiosis that helps to nurture the bandersnatch grassbags' food supply. The huge colon of every adult savannah grassbag harbors a thriving culture of Saurorhizobium bacteria, similar to the Rhizobium that lives in the roots of legumes. These bacteria metabolize the dinosaur's excreta, fixing nitrates and making the dung a very rich fertilizer for future plant growth. Each savannah grassbag drops more than a ton of steaming feces each day, which attracts hordes of dung beetles up to the size of tennis balls. Within two days of dropping dung, a sauropat over two meters across will be completely buried by the actions of these insects. In doing so, they transport countless grass seeds and beetle eggs (of both the dung and grass varieties) into the newly enriched soil. The growth of grass within a stand that has been grazed (and defecated) over several times is far more vibrant than one that hasn't, due to the nitrogen-fixing actions of the savannah grassbag's colon bacteria. The savannah grassbags feed ravenously during the wet season, building huge reserves of fat and gaining up to six tons in weight. Great masses of adipose tissue collect on the dorsal fin, giving them a hump-backed appearance. The male savannah grassbags acquire a striking blue-and-black striped head and soon the savannah shudders with the sounds of must-ridden bulls trumpeting, battling rivals and seeking to mate with every receptive female within sight. As the wet season begins to wane, mating ceases as good rattlegrass pastures become harder to find, forcing the savannah grassbags to collect in larger and larger congregations that overgraze and destroy the last few stands. These great combined herds of up to a hundred animals begin the long march towards reliable sources of water where they will wait out the dry season and lay their eggs. Those populations in the great rift valley have a fairly easy time, milling about in their thousands on the shores of the permanent lakes. Those in drier regions often have to make do with bare riverbeds where they must dig for seeps. A herd that fails to find water invariably perishes. For the duration of the dry-spell, the savannah grassbags will not feed nor move from the dry-season gathering area, surviving on their reserves of fat. The tissue in the dorsal hump is the first to go and within a month it has shriveled into a narrow sail. The dinosaurs face their fins away from the sun during the day and into the breeze at night, helping to stop their massive bodies from overheating. One remarkable aspect of the savannah grassbag's life cycle is that the eggs are timed to hatch at the height of the dry season. The females that mated in the previous year now deposit up to a hundred eggs in deep communal trenches at the heart of the gathering area. The eggs hatch in only three months and the meter long hatchlings spend the rest of the dry season growing within the cool shadows of the immense adults. The young will instinctively crop at what little vegetation is available, including algae in the shallows. However, most of their nutrition comes from a creamy paste regurgitated by the adults. This mixture is siphoned from the fat reserves but it also contains samples of the adults' vital gastrointestinal flora which are soon transferred into the young. Any adult that has recently had a drink will spontaneously regurgitate onto the ground at the sound of hatchlings cheeping. Aside from this the adults show no sign of affection towards the young and probably do not recognize their own offspring from other hatchlings. The strange breeding arrangement confers a number of advantages. The sauropods are now packed together in dense herds that form a daunting challenge to any marauding large theropods such as carcharodontosaurs. The stress of the dry-season invariably leads to the death of several adults that soon leave the carnivores too preoccupied to bother with the hatchlings. The dry-season is the only time of year when the adults stay in one location and can thus confer protection to their offspring. It also frees them up to spend all their time feeding and mating during the bountiful rainy-season. When the rains finally do arrive, the now badly emaciated adults disperse to seek out fresh pastures leaving the three meter long youngsters exposed and vulnerable. These form crèches and instinctively scramble for the nearest vegetative cover be it thorny scrub, reed beds, or forest edge. For the next six years, the young lead a reclusive lifestyle, eating whatever they can reach and suffering heavy losses from predators and fire. Once they reach a length of nine meters, the survivors acquire the adults' more specialized feeding habits and head out onto the plains to join them. The conservation status of the savannah grassbag is Least Concern due to successful conservation efforts and the savannah grassbag's wide range.