Almost all creatures sense magnetic field except us, human.
the earths magnetic signature is a negative polarity signature
It is Earths' "Magnetosphere".
For most animals, not at all. There was a theory that pigeons might be able to detect it, but that seems to be false.
Yes.
It is made by the movement of the earths core and magma field
The earths magnetic field results from deep in the earths core. Magnetic conduction from within the earths core is believed to be the cause of this.
because it has the hydro electric power to control the earths magnetic field
One navigation guide for animals during migration is the earths magnetic field. Many animals are sensitive to the magnetic fields and use them in navigation. The invention of cellphones with their towers are beginning to cause issues with some migrations due to the altered magnetic field around them.
earths magnetic field is generated by the circulation of liquid metal.
It is Earths' "Magnetosphere".
magnetosphere
No. Earth's magnetic field does not affect its axis of rotation.