A biped.
Creatures that walks on two legs are called bipeds.
A person who walks is called a pedestrian. A biped is any creature that walks on two legs, including human.
Legends holds that it is an ape who walks in two legs like humans do.
Any four legged animal is a quadruped. Man is a biped or bipedal, because he walks upright on just two legs.
A human being. Let me explain: First, when a baby is born, they crawl. Since a human has two legs and two arms, it seems like a baby 'walks' with four legs. Second, during the middle stage of our life, we walk upright, on two legs. Lastly, when we grow old, many people choose to or need to use a cane to walk with, giving the impression of three legs.
Humans
A human : While he is a child, he walked on 4 legs, Than he is an adult and he is walking on 2 legs but while he is old, he xalked with a cane, on 3 legs.
The riddle describes a person who uses a cane or walking stick for support. The "three legs" refer to the two human legs and the cane, while "walking up a hill on 2 legs" indicates that the person is walking upright, using the cane as an extra support.
tyranosaurus rex
Humans are bipedal because we walk upright on two legs.
A human? Yes because a baby crawls on four legs an adult walks on two legs and a OAP hobbles around with a walking stick,so has three legs.
A human.