pair of blue tits, cyanistes caeruleus, hanging from a tree trunk and luring each other by offering food

close cyanistes caeruleus aggressive animal background bark beautiful bird birds blue tits blurry brown closeup colorful eating feed feeding place female food forest fuss maker green hanging lure male mating ritual natural nature nesting time offer tree trunk ornithology outdoor outside pair pamper pine wood series shots sharp nails soft yellow spring two upside wild wildlife luring offering blurred