He found that one factor consistently improved the accuracy of a group's migration path — the age of the oldest individual bird in that group. (newscientist.com)
The method focuses the analysis on individual birds instead of species averages, making it a much more sensitive way to analyze biochemical responses to radiation. (sciencedaily.com)
Electronic tracking devices can work well for individual birds, but may not yield insights for an entire population. (sciencemag.org)