Which one of the following bird's species moves its neck back and forth with a jerk.

The correct option is Mynah.

Different bird species have unique anatomical adaptations and behaviors related to how they move their heads and necks:

1. Mynah: Mynahs are well known for moving their neck back and forth with a distinct jerky movement. This rapid forward and backward motion of the head helps them maintain depth perception and stabilize their visual field while walking or observing their surroundings.

2. Owl: Owls possess highly flexible necks that allow them to rotate their head backward to a large degree (up to about 270 degrees), but they do not move their neck back and forth with a jerk.

Therefore, the bird species that moves its neck back and forth with a jerk is the Mynah.