Crested-horn shark feeding on Port-Jackson shark egg, Sydney, Australia

Crested-horn sharks (heterodontus galeatus) sometimes feed on eggs from Port-Jackson sharks (heterodontus portus jacksoni), a similar-looking yet larger species of sharks. This evening in Cabbage Tree Bay (North Sydney, Australia), I stumbled upon this opportunistic individual, which struggled to eat the rival species’ egg, seemingly too big. The crested-horn shark extended its mouth as wide open as it could, but yet failed to swallow the egg. Its attempts stopped when a frustrated port-jackson shark noticed the scene and started chasing it.