Jeff Stanfield & Andy Shaver are joined by Dr. Philip Lavretsky, who is a professor at the University of Texas at El Paso. They discuss the pintail decline and the northern expansion of the Mexican Tree duck, what forced male ducks manifest bright colors, human impact on where waterfowl migrate, and what the first duck might have looked like millions of years ago.
Episode #742: Sam Primeaux
Episode #741: Cody Johns
Episode #740: Rory White
Episode #739: SkinWalkers & Magic Bullets
Episode #738: Patrick Nelson
Episode #737: Tex Cox
Episode #736: Cody Sellers
Episode #735: Sean Weaver
Episode #734: Quay Grant
Episode #733: Trae Waynes
Episode #732: World on Fire pt.5
Episode #731: Jared Goody
Episode #730: Stacey Coker
Episode #729: Toby Brohlin
Episode #728: Clay Reid
Episode #727: Michael Hunsucker
Episode #726: Nick Andrews
Episode #725: Dr. Mark Brockman
Episode #724: John Hill
Episode #723: Lewis Henderson
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