Jami` at-Tirmidhi Book 18, Hadith 23
That the Messenger of Allah (ﷺ) said: "Whoever kills a gecko in one strike, he has such and such reward, and if he kills it on the second strike, he will have such and such reward, and if he kills it on the third strike, then he has such and such reward."
From his father that he said: "I said: 'O Messenger of Allah! Is there no slaughtering except upon the neck and the throat ?' He said: 'If you stab its thigh it would be accepted to you.'"
That the Messenger of Allah (ﷺ) said: "Kill snakes and kill Dhut-Tufyatain and Al-Abtar, because they blind the sight and cause abortions of fetuses."