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© IStock/W1ZZARD Liger cub and other hybrid animals are more common than once thought. In the 20th century, animals such as mules and ligers that had parents of different species were considered biological flukes, but genetic sequencing is beginning to unravel the critical role of hybridization in evolution. The whale s teeth were what had caught molecular ecologist Eline Lorenzen s attention. Of the 18 chompers lining the front of the skull s mouth, some were twisted, not unlike a narwhal s tusk. But the 30-year-old specimen, hidden away in the basement of the Natural History Museum of Denmark at the University of Copenhagen, didn t have a tusk at all. When Lorenzen became director of the museum in 2015, she decided to examine the skull more closely. Working with a team of collaborators, she extracted genetic material and compared it with DNA from the teeth of narwhal and beluga specimens in the museum.

New mexicoUnited statesUnited kingdomErnst mayrJoana meierScott taylorEdgar andersonLeslie hubrichtMolly schumerUniversity of cambridgeUniversity of copenhagenNatural history museum of denmarkUniversity of colorado boulderUniversity of bernStanford universityEline lorenzen