The great shearwater (Ardenna gravis) is a common pelagic bird with a distribution that spans almost the entire Atlantic basin. which in conjunction with its relatively high abundance. makes great shearwaters an effective bio indicator. We compared δ13C and δ15N values from the feathers. https://www.diegojavierfares.com/mega-deal-Callaway-Rogue-Ladies-Irons-top-buy/