Pesquisa

is the Arrancar equivalent of the Shinigami ability to sense Reiatsu. It functions similarly to sonar. Out of the Espada, only Grimmjow Jaegerjaquez and Nnoitra Jiruga have been seen using this ability, mainly to determine how powerful their opponent is.

During his first, unauthorized, attack on Karakura Town, Grimmjow is seen using this ability, but it is not known whether or not his Fracción were capable of this ability as well.