Below are a couple of very efficient hunters - the Praying Mantis and the Damsel Fly.
Both are abundant in my garden at the moment due to the amount of prey available.
A good source of food for the preying mantis is the aphid, pictured below.
Mating out in the open is an ultimate sign confidence for these large stink beetles.
Appropriately named, they would not provide a tasty treat for any creature that decided to put them on the menu.