I was recently enjoying watching the birds on our backyard bird-feeder. This particular feeder has 4 spring-loaded perches, which will only support the weight of small birds, causing larger birds such as robins and blackbirds to cause the perch to drop, and they have to struggle to hold on, usually unsuccessfully. It also deters squirrels.
Sparrows, though small in stature, are vigorous in their defense of a good perch and free meal. As you can see in this sequence, the small guy on the rightmost perch made it clear: he would not yield!
The intruder moved on to his own perch and there was peace, for a while.
These were taken with the Sony NEX 6, Sony 55-210 zoom, and my newest purchase, a Sony VCL DH-1758 lens converter. This converter, made for various Sony point and shoot and video cameras, fits the NEX lenses with a step up adapter and provides a 1.7x increase without a loss of light. With this much magnification, a tripod is recommended. Edited and cropped in Lightroom 4. More on the VCL DH-1758 in posts to follow.