Add Yahoo as a preferred source to see more of our stories on Google. The cooing birds that many have sung about at Christmas are once again a hot topic. The Guardian reports that U.K.

The effects of p,p′-DDE on the intensity of male Ringed Turtle Doves' courtship behavior were determined for dietary levels of 10 ppm and 50 ppm (dry weight). Pairs of doves were placed in cages for ...