Earliest example of animal nest sharing revealed by scientists
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https://phys.org/news/2019-02-earliest-animal-revealed-scientists.html
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dyke, G., 2019. A mixed vertebrate eggshell assemblage from the Transylvanian
Late Cretaceous. Scientific reports, 9(1), article 1944. Open Access
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https://www.researchgate.net/publication/331080331_A_mixed_vertebrate_eggshell_assemblage_from_the_Transylvanian_Late_Cretaceous
Yours,
Paul H.