Niels Kerstes et al. report a citizen science effort to record the shell colour and banding patterns of nearly 8000 Cepaea nemoralis snails in the Netherlands to understand the potential evolutionary effect of urban environments on that snail species. They find that snails in urban centres are more likely to be yellow than pink, which may be explained by thermal selection.
- Niels A. G. Kerstes
- Thijmen Breeschoten
- Menno Schilthuizen
