The wing tag pictured on this hawk doesn’t seem at all invasive compared to the huge, orange, double patagial tags on this Great Egret, captured on digital by a Flickr photographer. Click here for that image.
I’m not a biologist, so I make these comments without knowing the full benefit of each study in question. And, I understand why patagial tags are used — for easy visibility and tracking. It was impossible for me to miss this hawk’s blue tag, and thus easy for me to report the bird. (Of course, I was able to do the same recently with a crow who had color-coded leg bands and no wing tags.) I’ve also read that in some cases, such as with Turkey Vultures, leg bands are not practical or healthy because of the way vultures cool themselves by defecating on their own legs.
In other cases, however, I found abstracts which suggest that in some species, patagial tags do affect the behavior and well-being of the marked birds who spend more time preening because of the patagial tags. And this, in turn, affects how much time they devote to other important activities. A few study abstracts I came upon documented the negative effects of wing tags on Ruddy Ducks, Common Eiders, Adélie Penguins (flipper tags), and Carnaby’s Cockatoos. I found one documented case of a White Pelican that died because of tag entanglement, and I’ve heard a few anecdotal accounts from people who’ve seen tags that seemed to cause distraction and preening in the birds they observed.
Personally, I find it difficult to look at a marking that so drastically alters the appearance of a bird, as in the case of this Great Egret I mentioned earlier. The crude, anti-collision orange markers on the egret seem obscene in any context — and the photographer who captured that image suggests the same. In terms of visibility, even if patagial markers are needed for critical studies, it seems the tags could be a fraction of the size worn by the hawk I photographed — and still be easily visible with binoculars, a scope or a telephoto lens. Actually, even a point-and-shoot with a reasonable zoom could focus in on a tag not nearly this large.
How do you feel when you come upon birds with large single or double wing tags? Does it bother you at all, or do you feel the benefits outweigh the negatives?