A toad heart with "two ventricles"

The experimental animals - common toads (Bufo bufo) - in a total amount of 36 were collected in the vicinity of Syktyvkar (Russia, Komi Republic) during summer (August, 2017). While performing the experiments there was found a sample with two closely connected ventricles. The additional ventricle displayed electrical activity, however, it did not have any effect on ventricular hemodynamics. The data obtained may be of value to environmental scientists, biologists and physiologists involved in researches on the cardiovascular system.