Today 21/05/2015 around 11am i was standing outside the back of our offices observing the birds making nests in a tree just outside of our property, i took a photo hoping i could zoom in as i wanted to see how many birds have made a nest in the tree, after view my photo and zooming to take a closer look i noticed a weird looking object in my photos, seconds after i had taken the photo i viewed it, then immediately looked up into the sky into the direction the object would have been but it was already gone, i have also tried to reinact the situation to try and figure out what it might be but nothing, its a very clear day with no wind, no clouds, no airplanes in our area, the object was definitely quite a distance as i zoomed in to take a closer look it starts to pixalate and if the object was pretty close you'd be able to view the object properly. I have circled the object in red on the left and the one on the right is a bird to compare the different sizes. I would like to know what the object is please and if you can assist in this regard i would greatly appreciate it, please advise what this object might have been. Thank you