1) Animal by eating behavior 
A spongivore is an organism that feeds primarily on animals of the Phylum Porifera, commonly called sea sponges. ==Examples== The hawksbill turtle is one of the few animals known to feed primarily on sponges. It is the only known spongivorous reptile. Sponges of various select species constitute up to 95% of the diets of Caribbean hawksbill turtle...
an animal that eats primarily sponges