Crustacean larva stop after a single copepodid stage. Once the gonads develop, there are no further moults. Chalimus (plural chalimi) is a stage of development of a copepod parasite of fish, such as the salmon louse ("Lepeophtheirus salmonis"). "Chalimus" Burmeister, 1834 is also a synonym for "Lepeophtheirus" Nordmann, 1832. The single genus in the Facetotecta, "Hansenocaris", is only known from its larvae. They were first described by Christian Andreas Victor Hensen in 1887, and named "y-nauplia" by Hans Jacob Hansen, assuming them to be the larvae of barnacles. The adults are presumed to be parasites of other animals. Crustacean larva Crustaceans may
Canada goose urban and cultivated areas, which provide food and few natural predators. The success of this common park species has led to its often being considered a pest species because of their depredation of crops and their noise, droppings, aggressive territorial behavior, and habit of begging for food (caused by human hand feeding), especially in their introduced range. Canada geese are also among the most commonly hunted waterfowl in North America and northwest Europe. The Canada goose was one of the many species described by Carl Linnaeus in his 18th-century work "Systema Naturae". It belongs to the "Branta" genus of geese,