Larvae of Drosophila and other related insects, such as the medicinal blow fly (Phaenicia sericata), demonstrate a thermal preference. What drives the differences in behavioral response among species is not fully understood but is likely driven by evolutional adaptive pressures. Larval Drosophila melanogaster with over expression of genes coding for the TRPA1 receptor (i.e. the capsaicin or heat receptor) in sensory neurons are repelled by capsaicin or high heat (>28oC) whereas the non-over expressers show no behavioral response to capsaicin. The larvae of Phaenicia sericata are attracted to heat when placed in cold environment (10oC); however, this response is not as robust in larval Drosophila with or without over expression of the TRPA1 receptor. The larvae of P. sericata are attracted to heat over a food source when placed in a cold environment. Comparisons with larval Drosophila, with over expression of TRPA1 receptor, reveal robust avoidance of the heat or capsaicin. An interesting phenomenon occurs when P. sericata are placed at 4oC, they huddle which is not seen with Drosophila even when overexpressing the TRPA1 receptor. Is this an evolutionary survival skill for P. sericata to find decaying animal material and a cooperative group survival when exposed to cold?