08/27/2025
Meet Eau10b, the first known inters*x southern right whale — a creature that challenges how we define s*x in biology.
In a groundbreaking discovery, scientists have identified the first known inters*x southern right whale.
The whale, known as Eau10b, was originally sampled in 1989 off Argentina’s Valdés Peninsula, but it wasn’t until 2022 that graduate student Carla Crossman uncovered surprising genetic clues.
Initially classified as female due to its two X chromosomes, Eau10b also carried the male-defining SRY gene, found only on the Y chromosome. Further testing revealed an unusual XXY combination, indicating that Eau10b was inters*x — neither male nor female.
Inters*x animals like Eau10b challenge long-held assumptions about binary s*x classifications in nature.
Though rare, inters*x individuals have been documented across various species, from whales to pigs to humans.
Their roles in social species may extend beyond reproduction, offering unique contributions to group dynamics. As genetic tools improve, scientists are uncovering more exceptions to binary norms, illustrating that biological s*x is far more complex than once believed.
Eau10b’s story is a vivid reminder that nature often resists simple categories—and that every exception broadens our understanding of life’s diversity. *x *xpride
