Sea urchins have modified mouth parts on the underside of their bodies called an Aristotle’s lantern. The lantern is made up of tooth-like plates that scrape up bits of food like algae, as seen here.
We specifically don’t scrub the algae in this habitat for the urchins, and I see them on the walls all the time, presumably getting a tasty meal. But I had never seen it in action before last week! Invertebrates are such cool little aliens!
If it fits, it eats! The giant 🐜eater’s elongated head & nose are perfectly shaped to get in & out termite mounds & 🐜hills. The anteater’s narrow
tongue is about 2 feet long and is shaped like a strand
of spaghetti. This amazing tongue has teeny, backward-pointing spines
covered in sticky saliva that aid in feeding. Relying on its acute sense
of smell, the giant anteater detects an ant mound and swiftly rips into
it with its sharp, formidable claws. It then darts its tongue inside
(up to 150x per minute!), picking up the worker ants with that
sticky saliva. (source)