Compost FULL of grubs.

Went to go dig out the bottom of my pile and found it was full of grubs; like 1-2 grub per Cup of dirt. Can I sift out the grubs? They are huge, like 1” long and over 1/4th inch diameter. But I can’t see if there are smaller ones. Do grubs start out tiny like a grain of sand? I thought I might sift out the “dirt” using a colander, then pour the larger material onto a tarp and leave it in the sun and see if I can drive out anything smaller. Any suggestions? Thanks in advance.