“…There are various animals that are oophagous (feed on eggs), a behaviour that is in most reported cases facultative (e.g. Randall, 1967;Shiogaki & Dotsu, 1983;Whoriskey & FitzGerald, 1985;Daan, 1987;FitzGerald, 1992;Bloxam et al, 1996;Shine et al, 2004;Hirayama et al, 2005;Järnegren et al, 2005;Light et al, 2005;Mehlis & Bakker, 2009). In East African cichlid fish radiations, spectacular trophic behaviours like head-ramming and snout-engulfing allow some species specialising on eggs or fry of heterospecific fishes (Wilhelm, 1980;Ribbink & Lewis, 1981;McKaye & Kocher, 1983;McKaye & van den Berghe, 1997;Ribbink & Ribbink, 1997;Ochi et al, 1999).…”