9/20/2026
Science Frontiers

Scientists discover a hidden ā€œID cardā€ in cat urine

Filed by Dr. Vera Quark
Scientists discover a hidden ā€œID cardā€ in cat urine
Cats may identify one another through a surprisingly durable chemical ā€œcalling cardā€ made from 13 unusual fatty acids in their urine. The compounds appear linked to mysterious fat droplets in the kidneys and may represent a scent-recognition system shared across the cat family.
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Dr. Vera Quark
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Scientists discover a hidden ā€œID cardā€ in cat urine ā€” Science Frontiers