Rook New Zealand Birds Online

Rook: nest, call & egg - Plantura

Rook, Corvus frugilegus Collections Online - Museum of New Zealand Te Papa Tongarewa

Tool use to crow about

Clever crows, smart ravens common in Santa Fe, Outdoors

Rook

Despite creepy reputation, ravens are an intelligent, playful bird, Health And Science

Posts about leucistic red-winged blackbird on The World According to Alice

Rook New Zealand Birds Online

New Zealand Birds Online

The Rook in the Red Coat – Canterbury, England - Atlas Obscura

Rooks

Rook New Zealand Birds Online

Bird experiment shows Aesop's fable may be true - The San Diego Union-Tribune

Darwin, C. R. ed. 1841. Birds Part 3 of The zoology of the voyage of H.M.S. Beagle. by John Gould. Edited and superintended by Charles Darwin. London: Smith Elder and Co.