As I approach that golden age of retirement my birding hobby causes me to look to the avian world for guidance. Do birds retire and perhaps seek that perfect habitat where food and water are plentiful and the temperature ideal all year long? Do they give up those long migrations and the work of nesting and breeding? Do they recreate with other aging birds, have more time for song, or perhaps help with raising of the grand and great-grand chicks? Birds, I know do not crave a large nest egg; for them that just signifies the nefarious work of a parasitic cowbird and means another large mouth to feed. (See earlier post “Birds Behaving Badly / Brood Parasites”, 8/22/2015) In short, is there a golden age for birds?
There seems to be two distinct approaches to this issue in humans; those who want to keep working or must work until they die in the saddle, and those who crave and can afford the free-time of retirement. You can’t explore these issues for birds until you figure out how to determine the bird’s age, and they don’t make that easy.
Bird size is not a reliable dating tool, nor is bird song. Some have observed that second year males often have weird or incomplete versions of the adult song, but you can’t rely on it for dating. Early dating by plumage is straight forward, using natal down and the rapid progression to juvenile plumage, which is usually duller than the adult’s and often spotted or striped. But by late summer, fall, or early winter, depending on the species, the “first winter” plumage develops which is usually very similar to the adult.
Judging the age of adult birds then becomes much more difficult. The annual or biannual molt makes the shabby and worn out feathers all new again, like repairing the wrinkles of age. Wouldn’t a yearly face-lift or tummy tuck be great? Luckily some birds, gulls in particular, have a yearly progression of plumages allowing first year, second, third, and adult age designations. Learning these variations is difficult and requires a good guidebook or an experienced colleague.
Another dating technique is called skulling. One can observe the air cavities in the bird’s skull by wetting and separating the feathers. The maturing skull apparently goes through a specific and progressive pattern of pneumatization and maturation, visible through the bird’s thin skin. This is obviously a tool for ornithologists–don’t try this at home. That leaves banding, the most definitive technique in determining the birds age, but again a technique for the experts. These basic facts are now known: birds in the cooler temperate zones live shorter lives than those in the tropics, rural birds live longer than urban birds, large birds live longer than small birds, and young, inexperienced juveniles have the highest mortality rate of all.
I was surprised to learn that the annual mortality of passerines was 70% in the temperate zones. The longevity record for the Bald Eagle and Osprey is 22 years, 16 years for a Northern Cardinal, and 7 years for a House Wren. But these were the lucky ones. Message to birds: avoid risky juvenile capers, leave the city and head to the tropics and stay there, and don’t volunteer to be a canary in a coal mine or a clay pigeon.
D.J. Holmes and others, writing in “Experimental Gerontology”, has noted that birds have relatively longer life spans compared to similar sized mammals, especially given their warm body temperatures, rapid heart rates, high glucose levels, and high metabolic rates. These are usually harbingers of rapid aging, but not so with birds. Some seabirds in particular age very slowly and actually increase their reproductive activity with age. Apparently birds have evolved specific adaptations to offset the cell damage caused by oxidative and glycosylative compounds, mechanisms not found in mammals. Is there a hidden “Fountain of Youth” under all those feathers?
So it turns out that birds do not retire and enter a life of leisure but rather press on or even increase their activity and fecundity with age. That is until they just drop, fly into a window, or are snatched away by a more agile hawk or owl. I’m sorry to learn this, but maybe we humans can adapt some of their techniques for staying young. Life in the tropics sounds good, so I for one will become a “snow bird” and head south this winter. I’m also interested in those avian chemical adaptations. Maybe there’s an investment opportunity lurking here.
Fly safely into your retirement. Best wishes, Tanja.
LikeLiked by 1 person
Wishes gratefully accepted.
LikeLike
Wonderfully informative post! And from someone who is taking a bit of a break from work, retirement looks pretty good so I hope you enjoy it!
LikeLiked by 1 person
Thanks; not quite there yet but its on the near horizon. More time for birding.
LikeLiked by 1 person
Very interesting post.
LikeLiked by 1 person
Thank you.
LikeLiked by 1 person
Reblogged this on apserranoblog.
LikeLiked by 1 person
Thank you for that.
LikeLike
I loved how you linked birds with our life.
LikeLiked by 1 person
Thank you. Sometimes that works. I hope I haven’t overdone it. I appreciate your comment.
LikeLiked by 1 person
Thanks for reminding me that our struggles nothing compared to that of birds!
LikeLiked by 1 person
Point well taken. Thanks for your comment.
LikeLike
I wholeheartedly recommend retirement – it means one can watch birds with a clear conscience!
LikeLiked by 1 person
Im ready for it and plan to spend a good bit of time in the field. Thanks for your recommendation.
LikeLike
Such beautiful pictures and interesting learning
LikeLiked by 1 person
Thank you for your kind comment.
LikeLike
Why ever would a bird retire when it can fly, fly, fly! Really enjoyed. Thanks for sharing the birds. Love.
LikeLiked by 2 people
Good point. Birds and flight were great motivators for the Wright Bros. and others. Thanks.
LikeLike
I agree with Dr. Laura. Birds, like us at retirement age fly to new adventures. Good luck with retirement, more birds to see and photograph. There really is a big difference in average bird life expectancy. I would not have guessed a sparrow can last seven years.
LikeLiked by 1 person
I was just reading today about a 60 year old Laysan Albatross called “Wisdom”, the oldest banded bird in the wild. Quite a record and life. Thanks for commenting.
LikeLike
I love this very informative and fun post, and am so pleased that I discovered your blog! I, for one, retired from full-time work in upstate New York, moved to Florida full time, and quickly learned that I love working part-time….just enough to leave time for learning and birding and visiting out-of-town children and grandchildren.
LikeLiked by 1 person
Our life stories are similar, as is our passion for birding. Your blog also looks great and I plan to spend some time exploring your posts. Thank you.
LikeLiked by 1 person
Loved this post, Stephen! Fun and informative, gave me a lot of food for thought on the aging of birds. Those tropics surely do sound good, my hope is to be a ‘snow bird’ this winter also! 🙂
LikeLiked by 1 person
There’s an abundance of good birding sites in south Florida. Enjoy.
LikeLiked by 1 person