The dinosaur call can be used as a free, albeit less accurate, alternative to the radar, since any animals of the same species as the call being used will answer if they hear the call, even if they are fleeing from the hunter.
Tyrannosaurus produce a terrifying bone-shaking nightmarish roar when communicating; using the call horn will cause all other dinosaur species to flee in fear, while drawing in Tyrannosaurus from long distances away. This call has the farthest usable range in attracting prey. When it gets ready to charge, it's roar sounds similar to the death sound of the Tyrannosaurus.
Ceratosaurus calls resemble the roar the Tyrannosaurus makes when it gets ready to charge. However, the calls are slightly different. The sound is almost as nightmarish and bone-shaking as the Tyrannosaurus'. But somehow it's voice resembles the Allosaurus too but with a loud slightly lower pitched to the Tyrannosaurus too.
Spinosaurus calls are strange growls that sound somewhat like a motor being started up.
Wolves makes howls very similar to Earth's wolves, but also produces dog like barks.
In Carnivores: Dinosaur Hunter HD and Carnivores: Dinosaur Hunter Reborn, the dinosaur call is present under the name Dinosaur Decoy. This emits the call of the selected dinosaur to locate one on the M.I.S.T. device . Carnivores will be attracted to the call and come to the spot it was activated, so move to high ground or cover for an optimal shot once the call has been activated. Once used, the call has a 30 second cooldown period before it can be used again. The Dinosaur Decoy costs 150 gems to use, and will deduct 10% of the total points acquired on a hunt.