Run for myself

I found the dead lizard on the regle of the window a week ago. My first thought was the 'a big dust', but I looked at it carefully, I noticed that it was the lizard. I was in a hurry for going to my company that morning, so I didn't put away it. I expected my wife to clean it, I ignored doing it. But my wife didn't noticed it at all for a couple days. I thought it couldn't be helped, I cleaned it myself. But it was so shocked to see it. As soon as I picked it up, some red bugs were wandering on the body, so I threw it over the my garden. However, what on earth was it dead such a place?