A bizarre reptile once scurried through the Triassic treetops with an extravagant crest on its back, one made from neither scale, nor bone, nor feather.
N.B.1.8.1, dubbed “razor blade throat,” is the current dominant variant in the U.S. It's an offshoot of XVD.1.5.1, which is a descendant of the omicron variant.