1) Eating behavior 
Phagophilia or phagophily is feeding on parasites. German zoologist M. Beier reported that phagophilia is the feeding behavior of some pseudoscorpions. It was reported that many pseudoscorpions species co-exist with some packrat species, and two of them feed on packrat ectoparasites, to mutual benefit. This is an example of a Cleaning symbiosis. ....