What do you say when an animal is eating other animal?

It depends on the context and what you want to say. Here are some options:

Neutral:

* "The animal is eating another animal." (Simple and factual)

* "It's preying on it." (More specific to hunting)

* "It's feeding on its prey." (More specific to the act of eating)

Descriptive:

* "The lion is taking down a zebra." (Specific to the species involved)

* "The hawk is swooping down to catch its prey." (Highlights the method of hunting)

* "The snake is constricting its victim." (Highlights the specific hunting method)

Emotional:

* "It's brutal, but it's nature." (Recognizes the harshness of the situation)

* "That's the circle of life." (Refers to the natural order of things)

* "Poor thing, it's fighting for its life." (Expresses empathy for the prey)

Humorous:

* "Looks like someone's having lunch!" (Lighthearted and casual)

* "Nature is a cruel mistress." (Playful and sarcastic)

* "That's one way to get your protein." (Funny and relatable)

The best phrase to use will depend on your audience, the situation, and the tone you want to convey.