Grackle causal cognition experiment

For information about this experiment, see:
Blaisdell A, Johnson-Ulrich Z, Bergeron L, Rowney C, Seitz B, McCune K, Folsom M, MacPherson M, Logan CJ. 2019. Do the more flexible individuals rely more on causal cognition? Observation versus intervention in causal inference in great-tailed grackles. (corinalogan.com...) In principle acceptance by PCI Ecology of the version on 31 Jan 2019 github.com/cor....