What walks on four legs at the beginning then walks on two legs in the middle then walks on three legs in the end?

As I was going to St. Ives I met a man with seven wives, each wife had seven sacks, each sack had seven cats, each cat had seven kittens. How many were going to St. Ives?

Give me food, and I will live; give me water, and I will die. What am I?



I run over fields and woods all day. Under the bed at night I sit not alone. My tongue hangs out, up and to the rear, awaiting to be filled in the morning. What am I?

I went into the woods and got it. I sat down to seek it. I brought it home with me because I couldn't find it. What is it?

Humans
1
Gremlin
Dog
Don't know

the last one is a splinter

@TakenByYou

You got the first riddle wrong.

Um, First one: People
343
I have no idea
An animal of some sort
Splinter, i agree with Mattno