They did not spend a long time on shore because of a revolution , but Swainson returned to the UK in 1818 in his words `` a bee loaded with honey '' , with a collection of over 20,000 insects , 1,200 species of plants , drawings of 120 species of fish , and about 760 bird skins .
However , Swainson brought to England over 20,000 insects , 1,200 species of plants , drawings of 120 species of fish , and about 760 bird skins .