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Crustaceans: Diverse group of arthropods (a phylum of animals with jointed limbs and a hard chitinous exoskeleton) characterised by the possession of two pairs of antennae, one pair of mandibles (parts of the mouthparts used for handling and processing food) and two pairs of maxillae (appendages used in eating, which are located behind the mandibles). Includes crabs, lobsters, shrimps, slaters, woodlice and barnacles.
Incubation: The act of incubating eggs, that is, keeping them warm so that development is possible.
Mandible: In birds, the lower jaw and beak, but the term is also used to denote the two parts of the beak.
Monogamous: Having only one mate during a breeding season, or throughout the breeding life of a pair.
Subspecies: A population usually restricted to a geographical area that differs from other populations of the same species, but not to the extent of being classified as a separate species.