Agyrtria bartletti (Bartlett's Emerald) 

"Agyrtria bartletti (Bartlett's Emerald)" is a lithograph by W. Hart, a British artist active in the late 19th century. This detailed illustration showcases three hummingbirds perched on a branch of flowering plants. The vibrant colors of the birds, particularly the emerald green and iridescent blue, stand out against the delicate pink and yellow hues of the blossoms. Hart's meticulous attention to detail and accurate depiction of the birds' morphology exemplifies the scientific precision of ornithological illustrations.