it's mating season and many birds are looking for a mate to reproduce and create offspring
I need to find a mate so I can reproduce
hmm he might be a good mate
tweet tweet tweet
oh no, I don't like that song. Sorry, you will not be my mate
the two birds did not mate due to behavioral isolation. Behavioral isolation is when two populations do have the ability to interbreed, but don't due to differences in rituals/reproductive behavioral strategies. Behavioral isolation is shown in this example when the two birds do not reproduce together due to differences in mating calls.