Lucilia sericata, common green bottle fly
Certain aphids (Aphidoidea), commonly known as greenfly in Britain and the Commonwealth
especially, Myzus persicae, green peach aphid
Odontomyia chloris (syn. Musca chloris)
Tabanus nigrovittatus, a biting horsefly more commonly known as the greenhead horsefly, greenhead fly, or greenhead
Any of several kinds of common insects green in color
A red herring prospectus.
A herring that is cured in smoke and brine strong enough to turn the flesh red; a type of kipper.
A clue, information, argument etc. that is or is intended to be misleading, diverting attention from the real answer or issue.