I am a behavioural ecologist with a strong affinity for field work. The key goal in my various research projects has been and is to understand the causes and consequences of the tremendous variation in behavior and physiology that exists among individuals, populations and species. Currently I am mainly focusing on the role that hormones have in regulating bird migration, and on the physiological consequences of migratory behaviour. Further information can be found on my personal page: http://ifv-vogelwarte.de/en/home-ifv/staff/dr-cas-eikenaar.html