Penguin
Penguins cannot taste fish. This was discovered when a research team noticed they were missing some key genes for taste. A closer look at the DNA of penguins showed that all species lack functioning genes for the receptors of sweet, umami, and bitter tastes. It doesn't matter to them, because they swallow the fish whole. Birds do not swallow straight into their stomachs, as we do. They have a crop for storage and a gizzard with swallowed stones for grinding food. This compensates for their lack of teeth.