Maximilian recorded in his journal that on August 7, during an outing along the Lehigh River, several bullfrogs were captured and that "Mr. Bodmer made a sketch of two of them." He explained that such lively specimens were tied down with strings to hold them in position while Bodmer executed his careful studies.

As a zoological study, this watercolor of a female bullfrog made on August 8 at Bethlehem shows not only the artist's attention to detail but also his ability to represent his subject in a convincing, lifelike attitude.

Dated between January 12 and 18, Bodmer's Indian studies at New Orleans represent members of the Choctaw nation, which once had inhabited large areas of the state of Mississippi and parts of Alabama before being removed to the West by the U.S. government.

Returning home on December 31, 1832, from a visit with Say, Maximilian found that "a fine and large otter" had been delivered to his door by one of the local hunters. He subsequently bought it to add to his North American collection. He does not mention Bodmer's sketching this particular specimen, but an inscription identifying the subject of this drawing as indigenous to the Wabash suggests that it was made during the artist's stay at New Harmony.

The Prince and Bodmer left Boston on July 8 on the steamer Boston for New York by way of Providence. In Providence, Bodmer made several unfinished sketches of architectural details.