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Dogs are the domesticated subspecies of grey wolves.
The most ancient group of animals, they live underwater, lack real tissues and body symmetry.
A prehistoric flying reptile, similar to birds. However, there is no direct evolutionary...
Bottlenose dolphins are sea mammals which use ultrasound for orientation.
Blood vessels in fishes' gills absorb oxygen and release carbon dioxide.
Predators on top of the food chain prey on other animals. Their relationship is hunter and hunted.
This species is an excellent example for symbiosis. Living together with sea anemones they keep...
The tiny predator of the oceans. Interestingly, the male seahorse carries the fertilized eggs in...