Convenient and good infrared video for all these scenarios is hard to come by but would be useful. I think if the DoD was willing to put some money into the budget for practical recreations of UAP scenarios that they then make public, they could do a lot of good. But there'd probably be pushback about wasting money and also risks of leaking information about military sensor capabilities.
replyBut here is a paper showing penguins photographed with a temperature-sensing IR camera, showing the majority of the surface of their body being around -21ºC thanks to the highly insulating plumage.