Recycling Claws

I stumbled upon this scene this morning, which is the morning after recycling day. I posted a photo before of all the bags of recycled material, but this was the first time I've seen the next step. He picks up several bags at one time and drops them into this huge truck.

BTW, I've noticed that the recycling consists of probably 60% plastic. There's probably dozens of scientific papers written about this, but I wonder why there are fewer jars and cans?