Hierarchical structure of Arapaima scale, They live in piranha infested waters to combat these predators Arapaima Fish developed scales that can withstand the piranhas' bite force. Found to have a hard mineralized outer layer to resist penetration and a tough but flexible inner layer. The structure of the scale they have can become deformed when bitten by a piranha but not torn, broken or pierced protecting the fish from injury.

Tried to model this after reading "Impact Resistant bioinspired materials by Susana M. Estrada H." looked interesting
.