Barnacle goose Barnacle goose The barnacle goose ("Branta leucopsis") belongs to the genus "Branta" of black geese, which contains species with largely black plumage, distinguishing them from the grey "Anser" species. Despite its superficial similarity to the brant goose, genetic analysis has shown it is an eastern derivative of the cackling goose lineage. The barnacle goose was first classified taxonomically by Johann Matthäus Bechstein in 1803. "Branta" is a Latinised form of Old Norse "Brandgás", "burnt (black) goose" and the specific epithet is from the Ancient Greek "leukos" "white", and "opsis" "faced". The barnacle goose and the similar brant goose were previously
Polyphemus (crustacean) pairs of legs with exopodites, or outer branches. The legs are adapted for catching mobile prey, generally smaller species of water flea such as young "Daphnia" and "Bosmina". "Polyphemus" has two compound eyes that are fused to form a single unit, with a zoned set of receptors. This zoned structure is paired with an eye-control system that allows the "Polyphemus" to visually distinguish target size to avoid predators and track prey. "P. pediculus" is approximately in length. "P. exiguus", while similar in morphology, is smaller. Polyphemus (crustacean) Polyphemus is a genus of water fleas, and the only genus in the