A crab
Krill is in fact a type of crustacean. Whales are typically animals that consume large amounts of the crustacean krill.
Mantis shrimp are one type of crustacean that uses pigmentation for communication. They will often change or flicker colors during courtship and mating.
Exoskeleton
That depends on the type of crustacean in question; it varies between species.
No, prawns is definatly not a fish it is a type crustacean like crab, lobster and shrimp.
An octopus or squid
Lobsters belong to group called Crustacean.
Crabs
A rolly polly (woodlice) is a crustacean.
No. A barnacle is a type of crustacean; a monocle is a type of reading lens.
Sowbugs are a type of crustacean. Dinosaurs are a type of reptile. Sowbugs are not a type of reptile or dinosaur.
If you are doing the telegraph crossword the answer is lobster