Williams, E. H., & Bunkley-Williams, L. (2006). Three anomalies: A scythebill in the Greater Antillean Grackle (blackbird), a crown pattern in the Rock Beauty (angelfish), and a double spot in the Butter Hamlet (grouper), and their possible genetic significance. Revista De Biología Tropical, 54(S3), 161–169. https://doi.org/10.15517/rbt.v54i3.26910