I was in the garden the other day, and noticed this caterpillar on one of my dill plants.  Unfortunately it had eaten ALL of the plant, so I moved it to another dill.  This caterpillar is really tiny:  less than an inch long.  And the Stokes Butterfly Book tells us that when the caterpillars are small like this they look very much like bird droppings.  Good plan to keep from getting eaten by birds.  As the caterpillars grow larger, they become green, which camouflages them against the leaves on which they are feeding.  

 

I know that it is the larva of Black Swallowtail, because I've seen a few million of them.  It will grow, and split its skin several times before it pupates.  I just hope I have enough dill to feed this one until then.  

 

KEEPING MY FINGERS CROSSED!!!