A swallowtail laid eggs on my Sweet Bay at least once; I found the caterpillars. Unfortunately, something else did to, and apparently it ate them, because they vanished before they grew up.

This last time I got eggs, they disappeared one by one and I never found a caterpillar.  I think the swallowtail that uses Sweet Bay as a host plant lays single eggs here and there, so I'm not even sure what eggs these were. Next time the eggs go INSIDE to hatch!