Scientific Illustration by Subject: Birds: L
Landseer, Sir Edwin Henry (1802 -1873)
Wikipedia: Sir Edwin Henry Landseer
The Royal Collection: Sir Edwin Landseer
Royal Academy of Arts: Sir Edwin Landseer
See:
Edwin Landseer: zoology
Le Vaillant, Francois (1753 - 1824)
Wikipedia: Francois Le Vaillant
Francois Le Vaillant: Traveller and Ornithologist
Penny Olsen & François le Vaillant’s Histoire Naturelle des Perroquets
Cornell: Francois Le Vaillant
go to information about 
Lear, Edward (1812 -1888)
Lely
Leonardi, Vincenzo (fl 1621 - c. 1646)
The Royal Collection: Vincenzo Leonardi
A Paper Museum and the Academy of Lynxes
The Paper Museum of Cassiano Dal Pozzo
Books about the artist:
The Eye of the Lynx: Galileo, His Friends, and the Beginnings of Modern Natural History, David Freedberg
The Illustrated Book, 1780-1830: R. P. Lesson
Lesueur, Charles-Alexandre (1778 - 1846)
Birds!
Catalogue Essay
Purdue: Tropical Bird Sketch by LeSueur
Wikipedia: Charles Alexandre Lesueur
The Naturalists: Charles-Aleandre Lesueur
Lewin, John William (1770 - 1819)
Birds!
Catalogue Essay
Eastern Spinebill Illustrated by John Lewin
Birds!
Introduction
The Illustrated Book, 1780-1830: W. Lewin
art from artoftheprint.com
Lizars, William Home (1788 - 1859)
Walter Scott: William Home Lizars
Lodge, George Edward (1860 - 1954)
Wikipedia: George Edward Lodge
Wikimedia Commons: George Edward Lodge
National Museum of Wildlife Art: George Edward Lodge
go to information about Ludlow, J. W.
Lydon, A. F. (fl. 1880)
Biographical:
Illustrated British Bird Eggs.