Which type of large intestine worm was primarily studied by Ivan Mackerie?
Ivan Mackerle: Ivan Mackerle (March 1942January 3, 2013) was a Czech cryptozoologist, author, design engineer, and explorer. Ivan Mackerle:  He was most notable for his search of the Mongolian death worm, and he conducted three trips to Mongolia in 1990, 1992, and 2004. Mongolian death worm: The Mongolian death worm (Mongolian: олгой-хорхой , olgoi-khorkhoi, "large intestine worm") is a creature
He was most notable for his search of the Mongolian death worm,