Petrodromus tetradactylus (Four Toed Elephant Shrew) is a species of mammals in the family elephant shrews. They are found in Afrotropics. They are carnivores.
Comment: "Large" is ambiguous. For details on "Large rivers" (e.g. the Mekong river) see http://worldwildlife.org/biomes/large-river-ecosystems This class will be replaced with a less ambiguous class.
Definition: Number of individuals in a group that spends the majority of their time in a 24 hour cycle together where there is some indication that these individuals form a social cohesive unit.