UFO Sighting in Rio de Janeiro, State of Rio de Janeiro on June 28th 2015 – While photographing birds from Sugar loaf mountain this object was in the sky far higher than my subjects

While photographing birds from Sugar loaf mountain this object was in the sky far higher than my subjects. The daylight was exceptionally clear. We were on holiday. My wife and I observed this object for sometime. I photographed it in relation the high flying birds. It faded into the upper atmosphere. I thought it may have been a kite or even a child's balloon. I checked my camera download, thought that it may be worth reporting. Time on the photo is UK as my camera has never been reset while travelling. I have added the picture taken shortly afterwards, I have the tourist pictures taken before.