eli5: Why some animals are born with the instinct to eat meat, while others have the instinct to eat plants?

Question

eli5: Why some animals are born with the instinct to eat meat, while others have the instinct to eat plants?

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Answer 1

Different animals need different things to survive. They adapted to their food sources. They all kinda have the same ‘eat what I need’-insinct.

Herbivores have molars to grind vegetables, carnivores have sharp teeth to tear flesh, and omnivores have both. The entire digestive tract is different between species to survive on different foods.

Edit: this is all a result of the food ancestors had available. Look at the Galapagos Finches. Their beaks changed to accommodate different food sources.