Common cuckoo eggs are more resistant to puncture by the host.

Ma and Liang (2021) found that all cases of egg rejection by the Oriental reed warbler were carried out by the female and that the egg rejection rate (especially the ejection rate) of the Oriental reed warbler would show a decreasing trend in the later stages of its incubation ( Li et al., 2020 ; but see Ma et al., 2024 ).

also in 47,180 other papers