What do you call birds that eat mostly insects?

The story behind the answer

Insectivores are birds that feed primarily on insects—“insect” + “-vore” (eater). Many have adaptations for catching bugs, like slender pointed bills (warblers), wide gapes for aerial snatching (swallows, flycatchers), or sticky, barbed tongues (woodpeckers). This diet is rich in protein, which is why even many “seed-eating” songbirds switch to insects during breeding to fuel fast-growing chicks.

Insectivorous birds provide huge ecosystem benefits by naturally controlling pest populations. To remember: granivores eat grain (seeds), frugivores eat fruit, omnivores eat “omni” (everything), and insectivores eat insects. Think “bugs for bug-eaters.”