#Behavioral #flexibility is not the primary facilitator of a rapid #range expansion. Although we found high levels of flexibility in 2 successful urban bird species (great-tailed & boat-tailed grackles), only one (great) is rapidly expanding its range. This suggests flexibility alone doesn't drive rapid range expansions
#TheGrackleProject went to Florida to study boat-tailed grackle flexibility and compare it with the great-tailed grackles. These species look and behave so similarly, if they were right next to each other, I couldn’t tell them apart (except greats have yellow irises and these boats had brown irises). They are parking lot birds through & through! 🅿️
But in the aviaries, it becomes obvious really quickly that the great-tailed grackles are much more persistent - they will try and try to solve something, whereas a boat-tailed grackle often just sits on their perch 🐥, looks at the apparatus & decides not to even try
https://doi.org/10.24072/pcjournal.582
https://www.mpg.de/25000634/0701-evan-when-the-city-comes-to-you-150495-x