Crayfish and crab - good close up shots.
Location Unknown / Unclear.
Various close up shots of different types of crabs and crayfish moving around in water doing their usual activities. Some very good close up shots of different parts of their bodies and how they function. Voiceover talks about the species and their characteristics. Various hots of the crayfish fighting. One's leg is badly wounded and it cuts it off to allow for the new leg to grow. Various shots of the eggs, young crayfish, their development, etc. Very good close up shots of the growth and transformation of crayfish. We also see crayfish attacking and eating other animal.