The nervous system contributes to the success of birds as flying animals because of

The nervous system contributes to the success of birds as flying animals because of all of these following things:
1. the well-developed integrative center of the brain that controls eating, singing, and flying
2. the well-developed center used to coordinate movement and balance
3. the well-developed optic lobes

Thanks to these things, birds are quite successful at flying because of their developed nervous system.