the piranha behaviour changes with the size of the water area. if there is a lot of piranhas in a small area they will be very skittish. a piranhas behaviour changes in the wild because of the things surrounding it, mud, crabs, fish...
The Piranha's protect themselves with their teeth and speed.
The ones with the aggressive behavior are the red-bellied piranha, Pygocentrus nattereri.
Thier adaptations are thier stream lined shape,teeth,speed, and great smelling senses
adaptation includes behavior -- so yes.
-Swim in circles -Wait for prey -
No, not really.
There have been five movies with piranha in the title: Piranha (1972), Piranha (1978), Piranha Part Two: The Spawning (1981), Piranha (1995) TV, and Piranha (2010)
There is none, generally the Red-Bellied Piranha is the "regular Piranha"
Zebras have both structural and behavioral adaptations. These adaptations range from their stripes, their teeth, and to their herding behavior.
it is were it kinda lies
An Oscar is of the cichlid family, the piranha belongs to the characin branch. Otherwise known to freshwater aquarium owners as the bothersome "fin-nippers" which is what characins are known for, along with the skittish hyper behavior.
No a piranha does not have a shell!