The blue horned sperm worm
A caterpillar that is pink and as a blue horn and found in France is called a hawk moth. These moths can grow very large.
Lime Hawk-moth Mimas tiliae
There are several types of caterpillar that match this description. They can have a white belly with a blue back and black markings.
Not a Hawkmoth, this is a swallowtail butterfly caterpillar.
Really, nothing at all. They have the same colors, when they are caterpillars and when they are butterflies, so, (SOME) a caterpillar can be blue and white and the butterfly (COULD) turns out blue and white.
American Dagger Moth Caterpillar.... I found one in my drive way
it is a Lime Hawk Moth originating from England
tomato horn worms.
normally the blue and red wires are hot white is standaed for nutral,
Depending on where you live it might be some sort of Hawk Moth or a Fawn Sphinx. If you want to search for the Sphinx better enter "Sphinx kalmiae" otherwise most hits will be for the cat Sphinx. .
It can be a Monarch caterpillar or a Northern Florida caterpillar.
That sounds like a cinnabar moth caterpillar. They are toxic and can deliver quite a sting and are quite aggressive towards each other.