does anybody know a reasonably cheap drone with a thermal camera to detect animals hidden in a field?

Flir makes good IR sensors and their products range from cheap low-res to... awesome. They have a nice option combining thermal imaging and normal sensor so you overlay thermal data (low res) on a higher resolution image.

Btw I am not sure of your use case but you may find this interesting:

It is a passive system (no battery, no emission) and requires no drone ;)

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