The range of recorded foodstuffs includes cotton, linen, silk and wool fabrics as well as furs. They will eat synthetic fibers if they are blended with wool. Furthermore, they have been found on shed feathers and hair, bran, semolina and flour (possibly preferring wheat flour), biscuits, casein, and insect specimens in museums. In one case, living "T. bisselliella" caterpillars were found in salt. They had probably accidentally wandered there, as even to such a polyphagous species as this one pure sodium chloride has no nutritional value and is in fact a strong desiccant, but this still attests to their robustness. Unfavorable temperature and humidity can slow development, but will not always stop it.