Two mallard ducks make a triangular pattern of ripples as they chase each other in a tranquil pond. The male mallard has a distinguishing shiny green head, while the female mallard is more subdued, with speckled brown feathers.
photo-album.us/mallard-ducks.htm
An interesting photographic angle shows a tennis player in action. As the ball bounces toward the strike zone, the player pulls his racquet back, ready to swing. When the ball strikes the sweet spot of the racquet, it will be propelled over the net.
tennisrackets.us/tennis-court.htm
A young male tennis player wearing a yellow shirt rests a black, red, and yellow racket on his shoulder. He is standing on red clay courts, with green windscreens protecting the enclosure.