When I used to photograph the Bald Eagles at Mud Lock, I saw House Sparrows 
within the Eagle's nest as well, so I wasn't too surprised to hear that they do 
it to Ospreys as well.  I'm glad to hear that the sparrows may provide some 
benefit to the Ospreys, as well.  I hate the House Sparrows because they are so 
aggressive at the feeders and hog the bird houses. I tolerate them because they 
eat lots of bugs in my gardens and yard.  I've never had an insect problem 
because the birds take care of them.  

Sent from my iPad

> On Jun 8, 2014, at 9:43 AM, Candace Cornell <cec...@gmail.com> wrote:
> There is a family of house sparrows nesting with the ospreys again this year 
> at Salt Point. My Salt Point On Osprey Time blog #11 
> (http://www.lansingrec.com/parks/20-salt-point/salt-point-articles/27-on-osprey-time)
>  address this, but it has not been posted yet as our web master is in 
> Finland.  
> The fish-eating ospreys tolerate other species such as the sparrows, tree 
> swallows, starlings, and others to nest near them, usually under the 
> platform. It's probably some form of mutalism, but it has not been studied. 
> The smaller birds probably keep the nest cleaner with less ecoparasites for 
> the osprey to contend with. In exchange, the smaller bird get a sturdy 
> structure to build a nest on and the (passive) protection of the osprey 
> against predators. 
> I wish it had been a gnatcatcher. The house sparrows are ravishing the Salt 
> Point nest boxes, destroying the bluebird and tree swallow eggs that were 
> doing so well. 
> Candace
>> On Sun, Jun 8, 2014 at 7:50 AM, Karen Edelstein <k...@cornell.edu> wrote:
>> Last night, during our sunset walk at Salt Point in Lansing, Joe and I got 
>> some nice views of the osprey pair sharing a fish on the platform edge.  
>> When we were ready to leave (it was getting quite dark by then) one osprey 
>> was down incubating presumably while the other stayed alert on the perch 
>> (ha-ha... fish or pole or both). Some movement along the outside of the nest 
>> caught Joe's attention.  Although the light was terrible, I could see a 
>> long, twitching tail with a slight notch and very quick movements.  Blue 
>> gray gnatcatcher I'm guessing.  The little bird and the big osprey had to 
>> have been aware of each other but unbothered by each other's presence. The 
>> little bird worked its way around the edge and then into the nest itself 
>> before it got too dark to see anymore.  
>> What was going on? Gleaning bugs?  Anyone else seen this? Could it have been 
>> some species other than gnatcatcher?
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