The movements and locomotion are neccessary among the animals because of following reasons :

1. Need for searching of shelter, food and water.

2. To escape from predators.

3. For shifting to favourable environment from an unfavourable one.

4. The movemenets of alimentary canal help in movement of food from one part of alimentary canal to next.

5.  The ciliary movements help in the meovement of ova in fallopian tubes.

6. Movements of diaphragm and ribs help in breathing.

7. Movement of vocal cords help in the production of sound.