as old den trees disappear from nature, there are fewer natural cavitie

tree green woodland forest plant leaf flower garden nature trunk jungle wood branch autumn sculpture deciduous park old den trees disappear natural cavitie animal background bat bats beautiful bird birdhouse birds box branch chiroptera forest eurasian gap garden green handmade hole hollow home house life microbat natural nature nest nesting nuthatch old outdoor park season separation sitta europaea spring tree trunk wild wildlife wood wooden