PROBLEM TO BE SOLVED: To provide an artificial nest that is suitable for breeding and inviting primary tree hollow nesting birds, particularly kingfishers having hole digging capability lower than woodpeckers, without causing environment load.SOLUTION: An artificial nest for primary tree hollow nesting birds includes an outer shell surrounding a cavity so that the hollow may be formed inside. The outer shell has a nest opening perforation part being more flexible than a natural wood and formed of biodegradable materials on the hollow side part, and a rising part rising up from a hollow bottom to the lower end of the nest opening perforation part. The nest opening perforation part is formed more thinly, is formed more flexibly, or is formed more thinly and more flexibly in comparison with the rising part.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】環境に負荷を与えることなく一次樹洞営巣鳥類、特に、キツツキ類よりも穴を掘る能力の低いカワセミ類の繁殖、誘致に好適な人工巣を提供する。 【解決手段】内部に空洞が形成されるようにその空洞を囲む外殻を備え、前記外殻は、空洞の側部に、天然の木材よりも柔らかくかつ生分解性の材質で形成された巣口穿孔部と空洞の底部から巣口穿孔部の下端へ立ち上がる立ち上がり部とを有し、前記巣口穿孔部は立ち上がり部に比べて、より薄く形成されているか、より柔らかく形成されているか、より薄くかつより柔らかく形成されている一次樹洞営巣鳥類用の人工巣。【選択図】図1
