There is no such thing, as a number plants contain toxins/repellents to naturally protect from any (or at least most) pests. Locusts are known for destroying large areas of crops in massive swarms and far as I know are one of the top candidates for describing what you are asking (if I'm understanding the question that is).
An insect that starts with an "H," is brightly colored, and eats crops is a hornet. They are usually bright yellow and black and eat many kinds of plants and insects.
Owl
Spiders and praying mantis do.
there isn't an insect who feeds on fishes.
yes i think that is how it goes in a ecological pyramid.
a lizardfly
grasshopper
Owl
The nightingale eats spiders and ants.
The peach-potato aphid eats the leaves of trees like the peach tree. This insect can cause a lot of damage to trees as well as crops.
Spiders eats insect.
snails and ants