A heterotrophic mode of nutrition is observed in the kingdom Protista, Fungi, and Animalia.
In the heterotrophic mode of nutrition, the organism will derive nutrition from the harvested nutrition in the body of other organisms.
The organism may derive nutrition from the dead and decaying organic matter (Saprotrophism), by living in close association with the host's body (Parasitism), or by deriving nutrition directly from the stored nutrition from the body of the organism (Holozoic mode of nutrition).
Yes, all animals show the heterotrophic mode of nutrition.