There is also evidence of reorganization of the prefrontal cortex in humans throughout evolution that other non-human animals have not acquired.

The likelihood that a human being or any other animal could literally acquire an alien virus is effectively nil, as viruses are host specific.

The vertical burrows indicate that worm-like animals acquired new behaviours, and possibly new physical capabilities.

Murgatroyd, despite his small size and furriness, had all the human attributes an animal which lives with humans soon acquires.

But whatever the case, tool use is only one of the many varied and complex behavioural adaptations that animals have acquired in their struggle to survive.

An animal acquires the behaviour pattern by imitating it from another.

They don't turn into wolves or bats, but certain animals acquire the germ and become vampires.

Thus, the animal hunted by ancient man automatically acquired aspects of an equal, as if it were of one of the hunter's relations.

One animal, however, has acquired the ability to fish termites out of their nests very much more swiftly.

The story also tells how plants and animals acquired certain characteristics, and is related one of their medicine rituals.