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.
Bombus pensylvanicus
Although "Bombus pensylvanicus" maintains aposematic coloration and defensive stinger, it faces many predators. Predation is likely to be caused by attack to gain the resources of the hive, which contains carbohydrate and protein abundant nectar, larvae, and pollen. Predators consist of mostly mammals such as skunks, bears, and raccoons. Furthermore, bumble bees are predated on by birds for food. Foragers are frequently predated by invertebrates. Crab spiders and cryptically colored ambush bugs ambush bees at flowers to catch them. Robber flies resemble bumble bees and clasp the bumble bees, insert them with enzymes, then eat their internal organs. Wasps, such as the beewolf species "Philanthus bicinctus", intercept bees then paralyze them with venom, using them to nourish the wasp’s larvae. Assassin bugs and dragonflies are also common predators of the bee.