Beewolf
Beewolves (genus Philanthus), also known as bee-hunters or bee-killer wasps, are solitary, predatory wasps, most of which prey on bees, hence their common name. The adult females dig tunnels in the ground for nesting, while the territorial males mark twigs and other objects with pheromones to claim the territory from competing males.
European beewolf
Female European beewolves excavate their burrows in sandy soil or in vertical soil faces in open sunny places and these can be up to a metre in length with no less than three and as many as 34 short side tunnels at the end, each of which contains a brood cell. The material displaced by the burrowing wasp is flicked behind it as it excavates the nest. They nest in aggregations which may have as many as 15,000 burrows. The females hunt honeybees "Apis mellifera", which are paralyzed with the sting, the female stinging the prey through the articular membranes which are situated behind the front legs, the female then carries the immobilised bee to the nest in flight between the wasp's legs. On reaching the nest she often hovers over the entrance before slowly descending into the burrow. Each brood cell is provisioned with between one and five honeybees for the larva. After the larva has fed sufficiently it spins a cocoon, the cocoon is attached to the wall of the brood cell at its base. In cooler regions the larva overwinters and the adults emerge the following summer. Other species of bee, other than honeybees, have been reported as prey including "Andrena flavipes", "Lasioglossum zonulus" and "Nomada sp" in Britain as well as bees of the genera "Dasypoda", "Halictus" and "Megachile" in continental Europe. Each female may collect up to 100 bees during its flight period.