River otter poop is the perfect for Katrina Lohan's research as it contains DNA from worms, fish, and other organisms, including parasites. Image: National Zoo River otters are unequivocally cute. But ...

Rev. ed. of: Parasites of laboratory animals / Robert J. Flynn. 1st ed. 1973. "American College of Laboratory Animal Medicine." Collection, preservation, and diagnostic methods -- Biology of the ...