The metallic glint on this beautiful photograph gives a clue about the species of this swallow, though getting close to any swallow is difficult, as many photographers know. Tree swallow image; Credit: © Snowmanradio on WIKI (CC) Read more at http://www.earthtimes.org/nature/climate-change-laying-hatching-temperature/3011/#ToFdPtfg50pDVUqR.99