Pseudosphinx tetrio. I've just looked it up. It bites! Along with that it has hairs that come loose and imbed into the skin to cause iritation. Plumeria' seems to be it's primary food along with some others in family Apocynaceae. Hence two of it's common names; Fangipani Hornworm and Plumeria caterpillar. You must be their best green grocer friend in your neighborhood. Do you let them be or check there free for all with your flora somehow? They are quite large even for a hornworm! Still I find them quite captivating to look at. Ours here are tame in comparison but just as voracious for greens. I'm fairly sure ours don't bite but they do disgorge a droplet if disturbed similar to one thats doing it in your photo.
Five-spotted hawkmoth cat.
Manduca quinquemaculata (Haworth, 1803) Stuffed with Brugmansia sanguinea
