Let all quadrupeds lift their feet, so all thirty-five animals have two feet. At this point, * * * has seventy feet, and then as long as a pig puts down those two raised feet, the total number of feet will increase by two. We need to add 94-70=24 feet. As long as 65,438+02 pigs put down their raised feet, the remaining 35-65,438+02 = 23 is another biped (I forget what it is).