This is another specimen similar to the one photographed close-up, in its natural place feeding on the Brugsmansia. You can see why they are tricky to locate, as the light coming through the leaf is picked up by the fine white hairs, making the caterpillar a kind of chameleon. It would be very difficult for a bird looking up from the ground to spot this wooly bear against the leaf on which it's feeding. (Besides, Brugsmansias are poisonous, so it might not taste good anyhow.)