He recorded the caterpillar also known as the Hickory Horned Devil on a tree trunk in a cemetery in North Brunswick, New Jersey, USA.
The huge size of the caterpillar is well illustrated by being next to his iphone. At 14cms it is the longest moth caterpillar in North America.
At first glance, and being unfamiliar with this species, I thought the caterpillar was lying on its back with its true legs facing upwards.
More information on this amazing caterpillar and moth can be seen on the Regal Moth caterpillar page
Many thanks go to Jonathan for use of his images and his identification enquiry.
In response to increasing caterpillar inquiries from many states in the USA an American caterpillar gallery has been added.