Figure 1

Skulls of male M. nivalis (a) and S. araneus (b) showing the absolute juvenile (July) growth overshoot, the winter minima (February and March), and the regrowth (August and May) in braincase depth. See methods.

Skulls of male M. nivalis (a) and S. araneus (b) showing the absolute juvenile (July) growth overshoot, the winter minima (February and March), and the regrowth (August and May) in braincase depth. See methods.