1820 in birding and ornithology

Years in birding and ornithology:	1817 1818 1819 1820 1821 1822 1823
Centuries:	18th century · 19th century · 20th century
Decades:	1790s 1800s 1810s 1820s 1830s 1840s 1850s
Years:	1817 1818 1819 1820 1821 1822 1823

A summary of 1820 in birding and ornithology.