It may be that there are so many good nest sites on the property that the birds are more interested in the area and therefore more willing to fight for it.
(the birds; are; more interested in the area and therefore more willing to fight for it) (the birds; to fight; for it) (It; may be; that there are so many good nest sites on the property that the birds are more interested in the area and therefore more willing to fight for it)
the birds the birds It
are to fight may be
more interested in the area and therefore more willing to fight for it
for it
that there are so many good nest sites on the property that the birds are more interested in the area and therefore more willing to fight for it