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Dolphins and whales can only taste salt.

Compared to other members of the animal kingdom, humans are pretty good at tasting things. Our primate biology gives us the ability to detect five basic tastes: sweet, salty, sour, bitter, and umami (or savory). These five basic tastes create the nearly limitless flavor profiles of all the foods we enjoy (or detest) — but not allanimals are so lucky. Birds, for example, can’t detect spiciness in foods, which is why a pigeon could munch on a Carolina Reaper without a second thought. Taste also varies widely among mammals, and dolphins and whales may be some of the worst off, because they have devolved to only taste salt. That’s right — these unfortunate creatures have slowly lost their sense of taste over millions of years.

In 2014, scientists analyzed the genomes of 15 species of baleen and toothed whales, and found a massive loss of taste receptors across the board. Although these receptors were technically still present, they had been irreparably damaged by genetic mutations. Researchers were particularly surprised by the loss of bitter receptors, as many toxins in the sea have a bitter taste. This slow-but-steady loss of taste is likely tied to how whales and dolphins eat, as they tend to swallow prey whole rather than chew like many fellow mammals do. So while slowly losing their sense of taste is certainly a bitter pill to swallow, these cetaceans can’t taste it anyway