snails and ants
Yes. They eat ivy leaves or blackberry leaves.
The orange insect on sunflower leaves is a red sunflower seed weevil. It eats the sunflower seeds where its larvae hatches.
A lime green insect that eats the leaves in your garden could be a tarnished plant bug. When these bugs feed on the leaves they end up killing the leaf tissue.
a secondary consumer is where an insect or something small eats greenary such as grass leaves etc
A locust is an insect, not a plant (leaf). A swarm of locusts certainly eats a huge quantity of leaves.
Aphids eat rose leaves. You can get rid of them by spraying the undersides and top of the leaves. They cannot climb back up. You can also use a systemic fertilizer/pest control.
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