V Turdus Merula in the Sky migration

A) What is going on in the photo?
a) In my photo, there is a sizable group of 18  migrating Turdus Merula in other words, your common local neighborhood black Birds. The photo was taken around 9 years ago in Pennsylvania during late fall when in I spotted a bunch of black Birds in the sky forming a the shape of the letter V. 
B) How is it related to a specific human geography concept?
b) My photo has relation to the human geography concept of circulation because the birds were leaving to southern United States because of the warmer climates which suited the Birds much more, seeing that the weather would become quiet cold during the winter and food being of difficulty to obtain. This movement is not permanent though because the birds will return to Pennsylvania in mid spring.
C) Link the image to one of the five themes of human geography with an explanation of how it relates .
c) My image relates closest to the human geography theme of movement because of the large group of birds moving  from Pennsylvania to southern United States.

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