Heterocampa Biundata, Walker, study for book Concealing Coloration in the Animal Kingdom

Abbott Handerson Thayer was a distinguished figure and portrait painter who also became obsessed with the scientific study of animal camouflage. His book Concealing-Coloration in the Animal Kingdom (1909) was enormously influential, advancing the theory that natural color patterns evolved primarily for concealment. These Smithsonian studies of caterpillars were scientific illustrations supporting his theoretical work. The Heterocampa biundata, a moth larva with elaborate disruptive coloring, exemplified his argument about the power of pattern to break up form and create visual confusion that would later influence military camouflage design.

Thayer renders the caterpillar with the precision of a scientific illustrator rather than an easel painter, placing the specimen against a neutral background to show its coloration clearly. The painting method is controlled and descriptive, with careful attention to the specific form and markings of the larva. This is scientific visualization with artistic execution.