The two species of beetles used in this experiment, Tribolium confusum and Tribolium castaneum, are very similar to one another. Tribolium confusum or "confused" beetles acquired the name because it is often confused with Tribolium castaneum because of striking similarities between the two species. Some differences between the two species are that Tribolium confusum has segmented antennae that gradually and evenly increase in size, while Tribolium castaneum has similar looking antennae but with three large segments at the end. Tribolium confusum possesses a thorax with straight sides, while Tribolium castaneum has a thorax with curved sides. The Tribolium castaneum used in this experiment is a mutant strain of the species that is black in color, which helps to more easily distinguish it from the red Tribolium confusum.

There are three stages of growth in the life cycle of the beetles. The beetles start off as eggs, develop into a stage called larva that is the immature stage between an egg and t

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