What am I?

I start walking on 4 legs, then slowly move on to 2. I finally end up using 3. What am I?

related riddles

I am the only organ in the human body that gave itself it’s own name. What am I?

I shared by goats, devils, and unicorns. What am I?

Never falling, often moving. Untouchable, but sometimes deadly. Another danger signalling, often seen but never staying. What am I?