Mammals
New research suggests that young dinosaurs became independent quickly, forming their own groups and occupying different ecological niches from their parents, unlike mammals with extended parental care. This distinction could reshape understandings of Mesozoic ecosystems. The study, led by Thomas R. Holtz Jr. from the University of Maryland, was published in the Italian Journal of Geosciences.
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An international study of mammals in zoos shows that limiting reproduction through contraception or sterilization increases average lifespan by about 10 percent. The effects differ between sexes, with males benefiting from reduced testosterone and females from avoiding pregnancy's physical toll. These findings highlight a key evolutionary trade-off between breeding and survival.