Teflon

Teflon is a brand of a type of fluoropolymer coating created by DuPont, is also called PTFE (polytetrafluroethylene). It's used on lots of cookware to make them non-stick, on vascular grafts used in coronary bypass surgery, ironing board covers, heat lamps and prosthetic limbs. But it can be dangerous.

EWG has some studies showing it kills birds. Here's a quick summary from EWG:

Studies show that thermal degradation of Teflon leads to the slow breakdown of the fluorinated polymer and the generation of a litany of toxic fumes including TFE (tetrafluoroethylene), HFP (hexafluoropropene), OFCB (octafluorocyclobutane), PFIB (perfluoroisobutane), carbonyl fluoride, CF₄ (carbon tetrafluoride), TFA (trifluoroacetic acid), trifluoroacetic acid fluoride, perfluorobutane, SiF₄ (silicon tetrafluoride), HF (hydrofluoric acid), and particulate matter. At least four of these gases are extremely toxic - PFIB, which is a chemical warfare agent 10 times more toxic than phosgene (COCl₂, a chemical warfare agent used during World Wars I and II), carbonyl fluoride (COF₂ which is the fluorine analog of phosgene), MFA (monofluoroacetic acid) which can kill people at low doses, and HF, a highly corrosive gas.

Teflon can also appear on heat lamps. One University of Missouri study showed a 52% mortality rate for chicks. These chicks showed severe pulmonary damage and lung lesions. Even temperatures as low as 325F can cause deadly off gassing.