Consistent differences in eggshell phenotypes select for bluer eggs in an avian host-parasite system
J. Villa, P. A. Wisocki, J. Dela Cruz, D. Hanley
The paper finds that cuckoo eggs are browner than warbler eggs, suggesting negative frequency-dependent selection in their coevolutionary arms race.
bioRxiv · Oct 27, 2022 · PreprintEvolutionary Biology