Why we check nuts and dried fruit

I have been checking dried fruit and nuts for quite a while without coming across anything in them. Some may say that there is no reason for this.

However a while ago I came across something in an apricot.

More recently I checked a cashew and found this:

I assumed that that worm or maggot or whatever it is was dead. But then I poked or moved it and it started wriggling!! (shudder) You'll have to take my word for it; I didn't have the presence of mind to video it too.