THE upward forces produced by the heterocercal tails of two species of Selachii, moving transversely through water at various speeds, have recently been measured 1. It was found that the lift was ...

MOST people know the difference in shape that there is between the tail (caudal fin) of a salmon and that of a shark; how in the former the lobes of the fin seem to be equal or symmetrical (homocercal ...

Locals found a “blunt”-headed river creature near a cave in China and discovered a new species, a study said and photos show. Photo from Hong-Fu Yang via Lei, Pu, Yang, Zhu, Mo, Liu, Wang and Bi (2025 ...