 Cayley was long associated with the Gould League of Bird Lovers of New South Wales and was made an Honorary Life Member in 1935.The League published a large number of his paintings and his birds were reproduced on more than two million membership cards.Cayley truly believed in the value of ornithology and in memory of his father, he created a scholarship in Economic Ornithology at Sydney University, to be administered by the League and funded by royalties from "What Bird is That?"