Carpenter bees (the genus Xylocopa in the subfamily Xylocopinae) are large bees distributed worldwide. Some 500 species of carpenter bees are in the 31 subgenera.[1] Their common name is because nearly all species build their nests in burrows in dead wood, bamboo, or structural timbers (except those in the subgenus Proxylocopa, which nest in the ground). Members of the related tribe Ceratinini are sometimes referred to as “small carpenter bees”.

Carpenter bees are large, sturdy, shiny, black-coloured bees, some species having yellow markings on their heads. Carpenter bees may be mistaken for bumblebees.[4]

Carpenter bees make nests by tunneling into wood, vibrating their bodies as they rasp their mandibles against the wood, each nest having a single entrance which may have many adjacent tunnels. The entrance is often a perfectly circular hole measuring about 16 mm (0.63 in) on the underside of a beam, bench, or tree limb. Carpenter bees do not eat wood. They discard the bits of wood, or reuse particles to build partitions between cells. The tunnel functions as a nursery for brood and storage for the pollen/nectar upon which the brood subsists.

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https://en.wikipedia.org/wiki/Carpenter_bee