Birds That Invest More Energy Into Parenthood Age Faster And Die Younger

InnovationScienceBirds That Invest More Energy Into Parenthood Age Faster And Die YoungerByGrrlScientist,Senior Contributor.Forbes contributors publish independent expert analyses and insights. GrrlScientist writes about evolution, ecology, behavior and health.Follow AuthorApr 22, 2026, 10:06am EDT--:-- / --:--This voice experience is generated by AI. Learn more.This voice experience is generated by AI. Learn more.Aging is an evolutionary balancing act with reproductive effort.A Japanese quail (Coturnix japonica). (Credit: Dennis Hansen, image provided)Dennis Hansen, image providedI ran across an elegant little study that investigates the relationship between aging and reproductive effort. Basically, living beings are confronted by an evolutionary trade-off between investing their limited resources into reproduction versus maintaining their bodies so that investing more into reproduction is counter-balanced by accelerated aging and a shorter life span. However, the significance of these trade-offs remains debated because previous studies have produced inconsistent results.“All living things have limited energy and resources, and face trade-offs between competing priorities,” observed the study’s lead author, evolutionary ecologist Barbara Tschirren, an associate professor at the University of Exeter. One of Professor Tschirren’s main research interests is studying the evolution of life histories, with a special focus on cross-generational effects.“Evolutionary theory suggests there’s an intrinsic link between aging and reproductive effort — but this is quite difficult to test.”To investigate this relationship between aging and reproduction, Professor Tschirren and an international team of collaborators randomly split a captive flock of Japanese quail, Coturnix japonica, kept at the University of Zurich, into two flocks to create two independent biological replicates. They selectively bred the two captive populations so the birds either produced large eggs or small e...