High in the atmosphere there are very few gas particles, so heat transfer to the animal would be minuscule compared to its heat loss.
Work Step by Step
The high temperature means that the gas particles are moving very fast, but, there aren’t very many of them. Little warming of the animal would occur because of the relatively few collisions of fast-moving gas particles with the animal’s skin. On the other hand, the animal would rapidly lose heat to the thin atmosphere by radiation, so it would freeze rather than roast.