Hammersmith's Groves was given the sternest test of his unbeaten 10-fight career, climbing off the canvas in the third round and relying on animal instinct to stop his fellow unbeaten prospect in the sixth round.

BBC: David Haye stops Audley Harrison to retain WBA title

It is particularly associated with a dependence upon sexual activity, our most basic animal instinct, hence the reduction in the sex-drive and a return to a childlike, innocent self-awareness during recuperative states.

FORBES: The Perfect Marriage: Science Begins To Explain Why Antidepressants and Talk Therapy Go Hand in Hand

She is put through a mini-bullfight complete with a matador, picadores (lancers on horseback) and banderilleros (who thrust barbed darts into the animal) to test her speed, strength and instinct to charge.

BBC: Mexico City weighs bullfighting ban

The water had been cold, her teeth had chattered, but her hands had not let go of the oar perhaps she had been a true coward, or perhaps she had been overcome by animal instinct, hanging on to life blindly.

NEWYORKER: Alone