How do diurnal long-distance migrants select flight altitude in relation to wind?

Nocturnal passerine migration without tailwind assistance

(2011) HÅKAN KARLSSON et al.   IBIS

Trans-Sahara migrants select flight altitudes to minimize energy costs rather than water loss

(2009) Heiko Schmaljohann et al.   BEHAVIORAL ECOLOGY AND SOCIOBIOLOGY

Sustained bird flights occur at temperatures far beyond expected limits

(2008) Heiko Schmaljohann et al.   ANIMAL BEHAVIOUR

Wind Selection and Drift Compensation Optimize Migratory Pathways in a High-Flying Moth

(2008) Jason W. Chapman et al.   CURRENT BIOLOGY

Do Levant Sparrowhawks Accipiter brevipes also migrate at night?

(2008) HERBERT STARK et al.   IBIS

SOARING BEHAVIOUR AND PERFORMANCE OF SOME EAST AFRICAN BIRDS, OBSERVED FROM A MOTOR-GLIDER

(2008) C. J. Pennycuick   IBIS

Altitude choice by night migrants in a desert area predicted by meteorological factors

(2008) B. BRUDERER et al.   IBIS