Invertebrates are critters that don't have a backbone. So this type of fossil poop is from things like bugs and slugs. Long Time in the Making(Strings of Segmented Coprolites in Amber) Burmite Bug Poo(Invertebrate Coprolite in Amber) Pellet Pile(Invertebrate Coprolite and Trilobite) See No Weevil(Coprolite-Filled Broad-Back Weevil Cocoon) Crustacean Poo?(Ammonite and Coprolite Pellets)
