

Nuphar lutea (Nuphar lutea) is a poisonous, yellow-flowered aquatic plant. In Finland, it grows natively and is quite common up to the Arctic Circle in the north. It is modest in choosing its place of growth and is suitable for all types of water, from small ponds and streams to the bay. It usually grows from the coastal shallows to a depth of more than two meters as a floating leaf, deeper only as a submerged leaf. Other names for ulpukka include pulpukka, keltaulpukka, keltalumme, shield leaf, shield flower, river pig, pig's snot, pig's mullone and pig's pumpula.
The Eastern Hepokatti is about 5 centimeters long and can be heard from the bushes in Southeastern Finland in late summer. The strong neighing of the Eastern Hepokat can be carried up to hundreds of meters away at best. The vocalization of several hepokatts unites into a chorus, which makes the first-time listener suspect that the voice is caused by a bird. The loud chirping of hippopotamuses is an essential part of the end of summer in Imatra, and especially at night it makes you feel like you're abroad listening to the sounds of caskas. Hippopotamus make their sound differently than grasshoppers, namely by rubbing their wings against each other. Hepokatti's calls are exclusively male, while the female's aids include a saber-like egg deposit, which the female uses to lay her eggs on the ground. Hippopotamus eats meat, e.g. grasshoppers and their antennae are longer than the body. Above all, horse blankets are big. The eastern hippopotamus is the emblematic animal of Imatra.
Harjus or Harri (Thymallus thymallus) is an elongated salmon fish with a particularly high, sail-like dorsal fin. Harjus occurs in cool, gravel-sand-bottomed rivers and streams in Central and Northern Europe. In Finland, in eastern and northern Finland, also in river estuaries in the Baltic Sea. Harjus eats flying and crawling insects, which is why it is often caught with a fly and a lure. Harjus' diet also includes small fish, such as for example mutu. Grayling spawns in April-May. Then the sexually mature individuals migrate from their wintering areas to the shallow, gravelly flowing places of the rivers.