Hi, new to the forum!
Was wondering if anyone was able to access any of the following papers? Even just one would be a great help! :)

Hummel, D. (1983). "Aerodynamic aspects of formation flight in birds." Journal of Theoretical Biology 104(3): 321-347.

Hummel, D. (1995). "FORMATION FLIGHT AS AN ENERGY-SAVING MECHANISM." Israel Journal of Zoology 41(3): 261-278.

Badgerow, J. P. and F. R. Hainsworth (1981). "Energy savings through formation flight? A re-examination of the vee formation." Journal of Theoretical Biology 93(1): 41-52.

Thanks!

Hi, I can access 2 of them. Private message me your email address and I will send you them, K