Corylus americana, the American Hazelnut, is a species of the genus Corylus that is native to eastern North America. It is a medium to large shrub that under some conditions can take the form of a small tree.
The Gastropoda or gastropods, more commonly known as snails and slugs, are a large taxonomic class within the phylumMollusca. The class Gastropoda includes snails and slugs of all kinds and all sizes from microscopic to large. There are many thousands of species of sea snails and sea slugs, as well as freshwater snails, freshwater limpets, land snails and land slugs.
The class Gastropoda contains a vast total of named species, second only to the insects in overall number. The fossil history of this class goes back to the Late Cambrian. There are 611 families of gastropods known, of which 202 are extinct and appear only in the fossil record.