Crustaceans
There are lots of crustacean species living in the salty sea, although there are also species that live in fresh water and even on land. They are found throughout the world and vary in size from microscopic copepods to lobsters and giant crabs. Other examples include slaters, barnacles, amphipods, gammarids, shrimp and even the parasitic Sacculina carcini. All crustaceans (with the exception of barnacles) must regularly evacuate their 'house' (molt) in order to grow; their hard external skeleton is made from chitin which is inflexible. It takes a while for the new carapace to harden, during which time the animals are very vulnerable.
- Worlds full of smells
- Polished crab, foto fitis, sytske dijksen
In general, crustaceans have small eyes, with which they cannot see well. However, their sense of smell is exceptionally well developed. The antennae on their head contain small organs which help them to construct a three-dimensional image of the source of odors in the water. Therefore, the source (be it prey, an attacker or a partner) is quickly identified. The animals live in a world of scents, which is handy when living in turbid water.
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