Canadian geese, great egrets and red cardinals can be spotted around the lake, along with turtles and monarch butterflies – and behind the yellow-flowering goldenrods on the horizon, lie the skyscrapers of metropolitan New York. More than 300 different bird species have already been identified here, says Daphne Yun, a park ranger. Special nesting platforms have been built for ospreys, which have been so successful that rangers no longer need to build any new ones. A pair of eagles has been coming every year for 32 years, she says. Yun wears the green uniform of the US Parks Department and work…