Chasing prey.
Meaning: This means that an animal is pursuing another animal for food. It's like saying, An animal is running after another animal to catch and eat it.
Choice of Words: Chasing is a gerund form of the verb 'chase', which means to pursue. Prey is a noun referring to an animal that is hunted or pursued by another animal for food. Together, they describe the action of an animal hunting for food.
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