Welcome to DU!
The truly grassroots left-of-center political community where regular people, not algorithms, drive the discussions and set the standards.
Join the community:
Create a free account
Support DU (and get rid of ads!):
Become a Star Member
Latest Breaking News
General Discussion
The DU Lounge
All Forums
Issue Forums
Culture Forums
Alliance Forums
Region Forums
Support Forums
Help & Search
Science
Related: About this forumGreat frigate birds found able to fly for months at a time
There is a 4 minute video at the site. From phys.org:
[center][/center]
(Phys.org)A small team of researchers with members from France, the U.K., Canada and Germany has discovered that the great frigate bird (Fregata minor) is able to stay aloft for up to two months at a time. In their paper published in the journal Science, the team describes how they affixed trackers to several of the birds as part of a two-year study, what they found, and even offer some ideas on how the birds manage to sleep. Raymond Huey and Curtis Deutsch, with the University of Washington in Washington State, offer a Perspective piece on the work done by the team in the same journal issue.
To learn more about the birds, the group managed to capture several specimens during their infrequent and short stays on landthey held on to them just long enough to affix extremely lightweight transmitters that were capable of monitoring GPS positioning, altitude, heart rate and acceleration in any direction. That allowed them to track the movements of a variety of birds and how much energy they were exerting.
In analyzing the data, the researchers discovered that the birds were able to stay in the air so long for two reasons; the first is that the expend very little energy because they rely on updrafts to keep them aloft. The second reason is because when they do eat, they simply swoop down out of the air to catch a fish that has jumped out of the water to avoid a predator from below. They have to be careful though, because they do not have waterproof wings.
In charting their flight patterns, the team found that the birds travel incredible distancessometimes covering up to 250 miles in a single day. They also found that the birds were able to take advantage of another type of updraft when need be, they would slip under a cumulus cloud and allow themselves to be very quickly pulled upward (up to 5 meters per second), without having to flap their wings a single time. Such sudden elevations could take them as high as 1,600 meters, where the air is extremely thin, and the temperature freezing. From there, they would glide down for hours, until reaching another updraft.
more ...
(Phys.org)A small team of researchers with members from France, the U.K., Canada and Germany has discovered that the great frigate bird (Fregata minor) is able to stay aloft for up to two months at a time. In their paper published in the journal Science, the team describes how they affixed trackers to several of the birds as part of a two-year study, what they found, and even offer some ideas on how the birds manage to sleep. Raymond Huey and Curtis Deutsch, with the University of Washington in Washington State, offer a Perspective piece on the work done by the team in the same journal issue.
To learn more about the birds, the group managed to capture several specimens during their infrequent and short stays on landthey held on to them just long enough to affix extremely lightweight transmitters that were capable of monitoring GPS positioning, altitude, heart rate and acceleration in any direction. That allowed them to track the movements of a variety of birds and how much energy they were exerting.
In analyzing the data, the researchers discovered that the birds were able to stay in the air so long for two reasons; the first is that the expend very little energy because they rely on updrafts to keep them aloft. The second reason is because when they do eat, they simply swoop down out of the air to catch a fish that has jumped out of the water to avoid a predator from below. They have to be careful though, because they do not have waterproof wings.
In charting their flight patterns, the team found that the birds travel incredible distancessometimes covering up to 250 miles in a single day. They also found that the birds were able to take advantage of another type of updraft when need be, they would slip under a cumulus cloud and allow themselves to be very quickly pulled upward (up to 5 meters per second), without having to flap their wings a single time. Such sudden elevations could take them as high as 1,600 meters, where the air is extremely thin, and the temperature freezing. From there, they would glide down for hours, until reaching another updraft.
more ...
InfoView thread info, including edit history
TrashPut this thread in your Trash Can (My DU » Trash Can)
BookmarkAdd this thread to your Bookmarks (My DU » Bookmarks)
6 replies, 1532 views
ShareGet links to this post and/or share on social media
AlertAlert this post for a rule violation
PowersThere are no powers you can use on this post
EditCannot edit other people's posts
ReplyReply to this post
EditCannot edit other people's posts
Rec (29)
ReplyReply to this post
6 replies
= new reply since forum marked as read
Highlight:
NoneDon't highlight anything
5 newestHighlight 5 most recent replies
Great frigate birds found able to fly for months at a time (Original Post)
Jim__
Jul 2016
OP
KT2000
(20,585 posts)1. Incredible!
hope they are able to figure out how they sleep.
Auggie
(31,177 posts)2. I wonder if they sleep for two months ... like my cat
Roland99
(53,342 posts)3. I wouldn't mind being reincarnated as a bird...esp one of these.
airplaneman
(1,240 posts)4. I think this is a mistake
"Such sudden elevations could take them as high as 1,600 meters, where the air is extremely thin, and the temperature freezing."
1600 meters is 5328 feet - hardly extremely thin air and temperature freezing. About the same elevation as Denver.
-Airpalne
Jim__
(14,082 posts)5. Yes, the abstract to the paper says 4,000 meters.
You need a login to read the whole paper but here's the abstract:
Understanding how animals respond to atmospheric conditions across space is critical for understanding the evolution of flight strategies and long-distance migrations. We studied the three-dimensional movements and energetics of great frigate birds (Fregata minor) and showed that they can stay aloft for months during transoceanic flights. To do this, birds track the edge of the doldrums to take advantage of favorable winds and strong convection. Locally, they use a roller-coaster flight, relying on thermals and wind to soar within a 50- to 600-meter altitude band under cumulus clouds and then glide over kilometers at low energy costs. To deal with the local scarcity of clouds and gain longer gliding distances, birds regularly soar inside cumulus clouds to use their strong updraft, and they can reach altitudes of 4000 meters, where freezing conditions occur.
sangfroid
(212 posts)6. When I was in Australia
A naturalist told me frigate birds occasionally have to crash land because they have been aloft so long they have forgotten how to land.