EPOW - Ecology Picture of the Week

Each week a different image of our fascinating environment is featured, along with a brief explanation written by a professional ecologist.

6-12 February 2017

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Web-Feeder

Willow Tit (Poecile [Parus] montanus), Family Paridae
Khovsgol Lake, Mongolia

Credit & Copyright: Dr. Bruce G. Marcot

Explanation:  Tits, chickadees, and relatives are small forest birds that glean insects from leaves, conifer needles, tree bark, and other surfaces.  


Willow Tit in a Siberian larch, in northern Mongolia.

But here, in northern Mongolia, is the first time I ever witnessed (and videoed) one of them stealing insect prey caught in a spider's web, up in the tree canopy.  [Note: the video in the main entry, above, is shown at half-speed.]

Talk about a food web ... !
  

When one animal steals from another -- and this happens far more frequently, and among more species, than you might ever think -- it is called kleptoparasitism.  



This ingenious Willow Tit was indeed deliberately feasting on some poor spider's hard-won stock.  

At first, the tit was carefully extracting the insect apparently so as to not disturb the web -- perhaps returning, or intending to later return, for other fare.  

But then it got greedy and picked all the insects, destroying part of the web, which will likely be rebuilt ... and the cycle likely continued.  

      

          

Next week's picture:  The Most Southern Tree Fern


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