Mealworms

Those are Mealworms. 

Mealworms can feed on Grains, Fruits, and Vegetables, 

and Mealworms can be food for the Animals 

like Lizards, Birds, and Mammals. 

In Horror Movies like Xtro, Creepers, 

Beware! Children at Play and Warlock: The Armageddon, 

Mealworms could fed on Corpses and a Carcass. 

Those Mealworms were feeding on a dead Bird from "Xtro". 

Look at this. 

The decomposing Corpse Head was filled with Mealworms and Maggots feeding on it 

from "Creepers (Phenomenon)". 

There some Mealworms in the Man's injured Body 

that he saw from "Beware: Children at Play". 

Look at the Beetles and Mealworms on the Cross from "Warlock: The Armagedon". 

That was so creepy.