In an experiment due to Ferguson et al. (1967) a number of northern cricket frogs (Acris crepitans) were collected from the mud flats of an abandoned stream meandering near Indianola, Mississippi, and taken to a test pen lying to the north west of the collection point. After 30 hours of enclosure within a dark environmental chamber, 14 of them were released and the directions taken by these frogs recorded. 0 degrees means North.
data(ncfrog)ncfrog is a vector of 14 observations (in degrees).
ncfrog.rad contains the same observations in radians (pi/180).
Ferguson, D.E, Landreth, H.F. and McKeown, J.P. (1967) Sun compass orientation of the northern cricket frog, Acris crepitans. Anim. Behav., 14, 45--53.