Scavenger spiders

This spider would spawn only on deserts and rarely in savanna.
They are like normal spiders but with a light brown color and blue eyes.
The special thing about these spiders is that they dig their nests under the sand, so it's impossible to see the nest.
When a player or another mob walks over the nest, all the sand over it will fall, and the prey will be surrounded by scavenger spiders and they will attack the player.
If the player or mob was successfully killed or scaped, the spider will put back the sand blocks over the nest again.