Toxoplasmosis was found in three hairy woodpeckers Dryobates himalayensis himalayensis and one specimen of D. auriceps. These findings added another two species to those known to be naturally infected with Toxoplasma. The incidence of natural infection seemed to be rather high (perhaps in the order of 25 per cent.) The WPH strain of Toxoplasma produced no sickness in mice and was detected only in the 3rd mouse passage. It had been possible to compare the WPH strain with standard RH strain of human origin. Morphologically, they resembled each other, but biologically differed in that the former killed only 90 per cent. of animals and took longer to do it. Serologically, the Toxoplasma of woodpecker origin appeared to be similar to but not identical with the human RH strain. Interestingly, no antibodies could be detected either in the sera of the four infected woodpeckers or 12 other healthy specimens that have been tested so far. The sources and mode of infection as well as the epizootic significance of the findings were discussed.