Which mechanism limits the altitude that avian species can soar effectively concerning thermals?

💡 Explanation

As altitude increases, the air's temperature drops; humidity can condense and freeze on the feathers due to feather aerodynamics, diminishing lift with increasing altitude, ultimately limiting soaring, because icing increases faster at altitude. Therefore icing limits soaring, rather than buoyancy, stall, or failing sacs which depend on other atmospheric conditions.

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