What is known with certainty is that in 1932, large sums were offered to well-connected animal dealers in Antananarivo for specimens of Delalande's Coua, but they were unable to procure any.
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There is some disagreement about its area of occurrence: Although there were claims that the bird was also found in the area of Fito and Maroantsetra as well as near Toamasina (Tamatave), i.e., the coastal areas of northern Toamasina Province, all specimens with good locality data are from the offshore island of Nosy Boraha.
A number of animals are named after him, including the Coquerel's Coua Coua coquereli (Grandidier, 1867), the Coquerel's Sifaka Propithecus coquereli (Milne-Edwards, 1867), and the Coquerel's Giant Mouse Lemur Mirza coquereli (Grandidier, 1867), each of these species endemic to Madagascar.