Spotting

Those are great caterpillar photos. It is a late instar hawk moth larva - late instar because it is big and hawk moth because it has a tail horn. Hawk Moths have long been great favourites of mine. I used to breed them for release into the wild. Your photos are really good because they show an interesting charactristic of these caterpillars which I don't think I have seen in the larvae of any groups other than the Sphingids. When they stretch out their front end (the head and the three thoracic segments), the front end becomes very "cone-shaped". So the combination of being really big, having a tail horn and the pointed front end all indicate "Hawk Moth". I don't yet know the species in your photos, but I will let you know if I can ID it.