There have been many sightings of moor frogs (Rana arvalis) around Emäntälahti, which has become its mating habitat. The ordinary-looking moor frog is often confused with the common frog. The most certain way to recognise a moor frog is during spring and its spawning period from its glucking noise.
The spawning period of the moor frog is from April to May and only lasts a couple of weeks. The best way to get to hear its sound is in the evening as the sun sets for another night. The moor frog is quite shy and often stops its mating calls as people approach the mating area.