There's the danger of mercury poisoning and if you were to only feed canned tuna to your cat, they wouldn't get all of the nutrients they need. This is very unhappy news for Juniper the Cat, who only has cans of tuna on her Christmas wish list.
If you haven't been outside then you might not know it's been so hot you could probably fry an egg on cement but how hot is it for those that laid that egg?