useless trivia: What Word Means: Dreary - A River Fish?

Questions

A large Caribbean ---------- excretes a ton of sand a year. Using two oversized front teeth, it nibbles on seagrass and scrapes algae. Another set of teeth in its throat grinds up the coral it ingests.?

A ---------- in the wild usually makes no more than 20 kills a year.?

A male baboon can kill a ----------?

A male ---------- that has been neutered is known as a "wether."?

A male kangaroo is called a boomer, and a female is called a ----------?