Grey heron

Their breeding season begins at the end of February and lasts until early June.

An excerpt from the article 19 facts about grey heron

In the beginning, males look for a convenient location to build a nest, most often in the branches of tall trees, but sometimes also on the ground. They build them from any available material, most often from branches and grass. After building the nest, the period of females calling begins and when they are nearby, the males begin to wave and spread their wings and raise their beaks vertically up. The final stage of courtship is when the male and female touch each other with their beaks and stroke each other.