Innovations In The Design Of Hdpe T Rib...
Business & Finance0 min ago
No best answer has yet been selected by sfsorrow. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.Temperature does make a difference to the flight of birds, especially larger birds that rely on thermal currents for sustained flight. The mass and wingspan of the bird also need to be considered, heavy birds with small wingspans need to flap faster than light birds with large wingspans. Hence the humming bird which is heavy for its size with a tiny wingspan has to flap so fast its wings make a humming sound... so they were probably just different birds to what you see in your country.