Intrapopulational variation in head shape correlates with soil structure heterogeneity in a head-first burrowing amphisbaenian, Trogonophis wiegmanni
Morphological traits of animals have evolved to solve ecological requirements, the optimization of locomotion in each environment being one of the most frequent selective forces shaping morphology. Amphisbaenians are strictly fossorial reptiles that have evolved various snout shapes for burrowing head-first underground, yet the evolutionary and ecological origins of these different morphologies ar