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A news article https://www.earth.com/news/birds-with-darker-wing-feathers-have-increased-flight-efficiency/ links to a 2019 academic study
  Thermal impacts of wing coloration on surface temperature during bird flight.

Most of birds have dark upper wing feathers.Dark color keep surface hotter at sun compare to white colors..

How black color/hotter surface increase wings aerodynamics?

Maybe is key in airspeed ,fast airspeed over plane wing dont have time to heat up boundary layer so much. Birds and sailing boats operate at much slower airspeed so maybe have some benefits?

This news article links to a 2019 academic study: Thermal impacts of wing coloration on surface temperature during bird flight.

Most of birds have dark upper wing feathers. Dark colors keep a sunlit surface hotter compared to white colors.

Do black color or hotter surfaces improve the aerodynamics of wings?

A key consideration might be airspeed: fast air over a plane wing doesn't allow time to heat up the boundary layer so much. Birds and sailing boats operate at much slower airspeed so maybe those get some benefits?

A news article https://www.earth.com/news/birds-with-darker-wing-feathers-have-increased-flight-efficiency/ links to a 2019 academic study
Thermal impacts of wing coloration on surface temperature during bird flight.

Most of birds have dark upper wing feathers.Dark color keep surface hotter at sun compare to white colors..

How black color/hotter surface increase wings aerodynamics?

Maybe is key in airspeed ,fast airspeed over plane wing dont have time to heat up boudary layer so much. Birds and sailing boats operate at much slower airspeed so maybe have some benefits?

A news article https://www.earth.com/news/birds-with-darker-wing-feathers-have-increased-flight-efficiency/ links to a 2019 academic study
Thermal impacts of wing coloration on surface temperature during bird flight.

Most of birds have dark upper wing feathers.Dark color keep surface hotter at sun compare to white colors..

How black color/hotter surface increase wings aerodynamics?

Maybe is key in airspeed ,fast airspeed over plane wing dont have time to heat up boundary layer so much. Birds and sailing boats operate at much slower airspeed so maybe have some benefits?

A news article https://www.earth.com/news/birds-with-darker-wing-feathers-have-increased-flight-efficiency/ links to a 2019 academic study
Thermal impacts of wing coloration on surface temperature during bird flight.

Most of birds have dark upper wing feathers.Dark color keep surface hotter at sun compare to white colors..

How black color/hotter surface increase wings aerodynamics?

A news article https://www.earth.com/news/birds-with-darker-wing-feathers-have-increased-flight-efficiency/ links to a 2019 academic study
Thermal impacts of wing coloration on surface temperature during bird flight.

Most of birds have dark upper wing feathers.Dark color keep surface hotter at sun compare to white colors..

How black color/hotter surface increase wings aerodynamics?

Maybe is key in airspeed ,fast airspeed over plane wing dont have time to heat up boudary layer so much. Birds and sailing boats operate at much slower airspeed so maybe have some benefits?