Every year the season officially starts with the appearance of the European orchard bees (Osmia cornuta) [1]. This female has stuffed her nest and is busy closing it with clay.

References
1 Nederlands SoortenregisterBee hotel
Osmia cornuta (European orchard bee)♀︎
Every year the season officially starts with the appearance of the European orchard bees (Osmia cornuta) [1]. This female has stuffed her nest and is busy closing it with clay.
References
1 Nederlands Soortenregister