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Subadult Dakotaraptor taking down a Pachycephalosaurus with RPR.

Raptor Prey Restraint (also known as RPR) is a gameplay mechanic exclusive from Dakotaraptor. This technique is something that is practiced by raptors, like Dakotaraptor and even Acheroraptor. The player can practice RPR if it jumps to a suitable creature, where it will hopefully latch to it with its foot claws.

RPR is effective to kill prey of the same size or larger, by jumping to the back or to the sides of the prey and using LMB to bite and RMB to flap the player's wings and keep balance. At the bottom of the screen, a white line is displayed with a cursor that moves to the left or to the right, according to the player's balance. If the player is unbalanced, the cursor will move to the sides, turning the line into a red color, but if it is balanced, then the cursor will remain around the center, keeping the line white coloured.

RPR is useful to damage prey, without being injured in any way. When the player latches on to the back of prey, the player is safe from damage as long as they remain balanced. If the player looses equillibrium, it will jump off the prey item. Usually, adults have more experience with RPR than subadults or juveniles, due to their increased stamina and durability, and also because most of their viable prey items are usually about their size or smaller.

Raptor Prey Restraint is available in every stage of development of a Dakotaraptor, but hatchling RPR is very glitchy. Any attempts at making RPR while hatchling will result in a deformed image extension of the player's avatar, that will only retract after the player stops attempting it. Therefore, RPR is only practiced from juvenile stage and forward. Juveniles will start practicing RPR in small animals and, although you can attack any bigger animal, the damage will be unsignificant or you will easily loose balance. Juveniles are adapted to use this technique on small animals, like Acheroraptor and Palaeosaniwa. Subadults will have a wider range of prey with this technique, being able to take down Pachycephalosaurus, ornithomimids and Thescelosaurus, although practicing RPR in crocodylomorphs can be much riskier. For adults, almost anything worth RPRing (with the exception of Tyrannosaurus) can be latched onto by the player, unless the animal in question is substantially smaller than you, which will make balance difficult. Although Triceratops, Anatosaurus, Denversaurus and Ankylosaurus are very difficult game to pursue, an old adult could try to take one down.