This creature lays it's eegs near cliffs to the sea. The eggs roll into the water and for about 7 days the sea will be quiet. When they hatch it storms. The Alkonost is in general friendly towards mankind.
The Elwetrisch is a creature similar to a jackalope or a Wolperdinger but more common in south Germany.
They are apparently the offspring between elfs or domesticated birds like chicken, goose or ducks.
Interestingly enough their eggs are growing after they are layed.