Helicoprion is a long-lived genus of extinct, shark-like fish. Almost all fossil specimens are of spirally arranged clusters of the individuals' teeth, called "tooth whorls." They became extinct during the Early Triassic, 250 million years ago.
Bird enthusiasts are reporting rising numbers of snowy owls from the Arctic winging into the lower 48 states this winter in a mass southern migration that a leading owl researcher called "unbelievable." Thousands of the snow-white birds, which.