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Each color in this slice of a mouse’s eye is a different amino acid; green is glutamine, pink is taurine and blue is glutamate.

"Birds preferentially feed spiders to their offspring because spiders have 50 times the amount of taurine than insects," Uetz said.

“You have to supplement his diet,” Quintero said, recommending omega-3s and taurine, an amino acid critical for tigers that is also a main ingredient in energy drinks.

Instead, the cattle belonged to the taurine lineage that was introduced to the region from Anatolia via the silk route and northern Tibetan Plateau.

For example, one concern with vegan diets is a lack of taurine, which is essential for cats.