The bright white feathers of a pair of Pekin ducks ruffled in the summer breeze as they snoozed on concrete steps leading into the Chicago River at Ping Tom Memorial Park. The birds were unfazed by the whistling trains, the rumbling traffic of the city and the nearby gaggles of Canada geese and wild mallards. As former pets, humans didn’t disturb them either. That is until a woman from a bird rescue group tried to net them. When the ducks quickly dispersed, she took out a walkie-talkie and called for reinforcements. In moments, a volunteer whizzed by in a kayak, ready to catch the waterfowl wi…