How Many Eggs Left?

I have 4 corners. I have 4 sides.

All of my sides are the same length.

Who I am?

I don't have legs. I don't have arms.

I don't have ears. I live in the water.

I can swim well.

Who I am?

I have 4 corners. I have 4 sides.

I have 2 long sides and 2 short sides.

Who I am?

I am the second planet from the sun.

I spin the opposite direction as Earth.

who am I?

I am small. I have feathers.

I lay eggs. I can sing and fly.

Who I am?