Joseph-Philippe-François Deleuze, History and description of the Royal Museum of natural history… (1823)
“ They skim the surface of the water to catch molluscas and small fish. Some species ascend large rivers, others keep on the lakes. The cut-waters (rhyncops) , w hich are at the bottom of the case, are distinguished from all other birds by the extraordinary form of their beaks ; the upper mandible of which is like the blade of a knife, and much shorter than the inferior. This singular form renders it impossible for the bird to pierce any thing with its beak, but he uses it when flying over the surface of the waves, to seize the molluscas which float on them. ”
