英语听力：自然百科 大迁徙之繁衍生息 Need to Breed—18（在线收听）

 Here and now, cub and cub, pound for pound. The bodies of the falling litter the battle field. The females approach to the victorious males willingly, and with a discerning eye. They gravitate to the i/ storm, knowing that only the fittest gladiators can make a stand at the middle of the deadly arena. And they chemically choreograph to dance a mutual seduction begins. The cubs love ladders, hormone laden urine. He socks the soil with his brood. The smell may be packed with complex information about his genetic and physical fitness. Suitably pleased, she answers with her own stream of urine. His chromatic expression is known as flaming. He is /drilling the sand to a complex set of receptors in the roof of his mouth.