 Lü and colleagues (2011) suggested that these differences in tooth shape may indicate that each "Darwinopterus" species occupied a different ecological niche, with the teeth of each becoming specialized for different food sources.The robust teeth of "D. robustodens", for example, may have been used to feed on hard-shelled beetles.Because "Darwinopterus" is known from numerous well-preserved specimens including an egg, researchers have been able to deduce various aspects of its biology, including growth patterns and life history, reproduction, and possible variation between sexes.