[8] Like his older brothers Raphaelle, Rembrandt, and Rubens Peale, Titian helped his father in the preservation of the museum's specimens for display.

[9][10] In 1819–20, he and Say joined a government-led expedition to the Rocky Mountains led by Stephen Harriman Long, during which Peale made a large collection of drawings of natural objects and scenery.

[11][12] In the winter of 1824–25, Peale traveled to South Carolina and Florida to collect bird specimens for Charles Lucien Bonaparte's forthcoming quasi-continuation of Alexander Wilson's American Ornithology (1825–1833).

In Florida, he boarded for a short time at the farm of Bonaparte's cousin, Achille Murat, and returned to Philadelphia in April 1825.

[17] In 1838, Peale boarded the USS Peacock and served as chief naturalist for the United States Exploring Expedition (1838–1842) led by Lt. Charles Wilkes.

[1] In 1851, a fire at the Library of Congress destroyed nearly all of the 100 copies of Peale's expedition report, Mammalia and Ornithology (1848), and its publication was delayed.

[21] Peale shot his specimen in 1824 near Camden, New Jersey, and his drawing was engraved by Alexander Lawson and published in Plate 1 of Bonaparte’s American Ornithology; or, the Natural History of Birds Inhabiting the United States, Not Given by Wilson, vol.

[22] Peale developed an effective method for storing butterflies in sealed cases with glass fronts and backs, and parts of his collection of over 100 species still survive.