Pictured above is a pair of Great Tits.
Last year, researchers Els Atema, Arie van Noordwijk, and Simon Verhulst published the results of their study of Great Tits (Parus Major) in the journal Molecular Ecology. I bring it to your attention because I know that Neatorama readers take a great interest in this topic.
The scientists wanted to know if adding weight to a Great Tit, and thus increasing the physical workload it must endure while moving, would alter the telomere regions of its DNA sequence. They added a backpack weighing 0.9 grams to these birds and tracked their locomotion. At the end of their study, they found no significant changes to the attrition of the birds' telomeres. Perhaps the birds were physically stressed by the added weight, but they seemed to bounce back just fine.
Photo: Highway 45