Small cuckoo wasp

Description:

This small emerald wasp was seen hanging around the nest of a blue mud dauber. As soon as the adult mud dauber left the nesting area after covering the opening of the hole with mud, the cuckoo wasp flew in and started chewing on the mud wall to make a hole. The process was very quick and then she layed her eggs in the same hole and flew off ( https://youtu.be/hj80Ff81_pI ). Later when the mud dauber wasp returned to the nesting hole it patched up the opening with more mud.

Notes:

The term "cuckoo wasp" refers to the cuckoo-like way in which wasps in the family lay eggs in the nests of unrelated host species. They are generally kleptoparasites, laying their eggs in host nests, where their larvae consume the host egg or larva while it is still young, then the food provided by the host for its own juvenile (Wikipedia).