Which of these is an example of behavioral isolation?

The frog species Rana aurora breeds in fast–moving streams, whereas its relative Rana catesbiana breeds in still ponds.

Two species of pines, Pinus radiata and Pinus muricata, grow together in California, but Pinus radiata sheds its pollen in early February and Pinus muricata in April.

Two species of crickets, Gryllus rubens and Gryllus texensis, have different courtship songs which can be identified only by the opposite sex of their own species.

Question

Which of these is an example of behavioral isolation?

The frog species Rana aurora breeds in fast–moving streams, whereas its relative Rana catesbiana breeds in still ponds.

Two species of pines, Pinus radiata and Pinus muricata, grow together in California, but Pinus radiata sheds its pollen in early February and Pinus muricata in April.

Two species of crickets, Gryllus rubens and Gryllus texensis, have different courtship songs which can be identified only by the opposite sex of their own species.

anonymous · Answer

I believe the answer is 3.) Two species of crickets, Gryllus rubens and Gryllus texensis, have different courtship songs which can be identified only by the opposite sex of their own species.

anonymous · Answer

Yeah its the last choice