We examined the relationship between brood parasitism, nest location, egg shape, and eggshell thickness in waterfowl species. We found that within and across tribes, parasitic species did not have ...

(Nanowerk News) Eggshells are both marvels and afterthoughts. Placed on end, they are as strong as the arches supporting ancient Roman aqueducts. Yet they readily crack in the middle, and once that ...