When you use a tin can, do you always take the top right off?
Or do you not really think about it?
This is what can happen if you don't really think about it:
A lot of people will open the can until the lid almost -- but not quite -- comes away from the can. Then after emptying the can they'll push the lid back down, a little way inside the can. This makes a perfect trap for animals roaming around the waste tip (or in the report above, the sides of the road, where some herbert left this can) looking for food. There's food in there, which attracts the animal, and it puts its snout or paw in there to get at the food, and it can't get it out again.
Then it dies a very slow and unpleasant death.
If you leave cans like this, try pushing your finger in the gap between the lid and the wall of the can. Then try, very gently, pulling it back out again.
I always take the lid completely off the can, so it can't make a trap.
Then I put the can in the stove when it's burning to get rid of all the paper, paint and food residue.
Then I crush it and put it in the scrap metal bin.
I suppose I'm a bit obsessive about it.