GIANT SOUTH AMERICAN RIVER TURTLES
I recently became aware, by a TV program of giant South American river turtles living in the large Orinoco and Amazon Rivers in the tropical Amazon Basin of northern South America. And what impressed me the most about these giant river turtles is the annual gathering of hundreds of female turtles on gigantic flats of soil during the annual drought when river water levels drop dramatically. Those female turtles come together on the flats to lay their eggs at one time in the two and a half foot holes they dug in the soil with their back feet, one per turtle, on a bit higher part of the large, drying flats. Each female lays about a hundred eggs in the pit she dug. Digging a nursery hole a little uphill helps insure the turtle embryos don't drown before they hatch. Perhaps, in the past, through trial and error, the river turtles that may have deposited eggs to close to the river have no descendants today be...