Can anyone give me a hint on what this is?

I've always been wondering what is in this image.
This is my first thread, so may be a bit wonky.
I was taking photos of a local irrigation feature known as 'The stops.'
We used to swim here as kids.
Hopefully have attached two images.
The first was taken on Saturday, 26 December 2009, 9:12:11 AM (from the metadata)

The second was taken on Saturday, 26 December 2009, 9:12:13 AM (metadata again.)

If you use the outline of the dead tree with the branches showing above the treeline, you can get a relative aspect of the two images.
Nothing in the first image, two seconds later something was in the second image.
Have checked all the photos subsequently taken, no flaw or bug on the lense, and no trees nearby to drop litter that may have floated past my view.
Maybe someone can help me out.
Images were taken 2 kilometres North of Colbinabbin, central Victoria, Southern Australia.
Just created a Flickr account to host them

That's the first image.


That's the second image.
Just curious, maybe someone can explain it.
Thanks
First post, If I have messed up, so be it. Just was wondering about this.

looks like a dirt speck to me.

it appears just over the tree line so it gives the appearance of being far away and larger than it may appear, but it could just be a piece of dirt that was blowing in the wind, or a bug flying by.

For some reason not getting the full res. of the images on flickr.
was a 1600 X 1200 image originally.
It's late, will try again tomorrow

I guess as its a bright day and the picture is clear then you must have been using a fast shutter speed, so the object was probably fast and close to cause motion blur

I would go with insect like the infamous "rods"

I downloaded the image and zoomed in as far as I could go. In the higher zoom levels it looks like the object is much closer to the camera than the tree in the distance. My guess is a bug flying past the lens while you were taking the picture. On lower zoom levels, judging the distance was more deceiving.

My first thought was: Wow, those Kangaroos sure can jump high!