Crocodiles and capybaras share the same rivers across South America, often swimming just metres apart.
Yet attacks are surprisingly rare.

Here’s why.
Crocodiles are energy-efficient hunters. They don’t chase prey for sport; they strike only when success is almost guaranteed. Healthy adult capybaras don’t fit that profile.

Capybaras are strong swimmers, highly alert, and almost never alone. Living in large groups, they spot danger early and disappear underwater before a crocodile can launch an ambush. For a predator that relies on surprise, that’s a problem.

There’s also a cost-benefit issue. A full-grown capybara can fight back, injure a crocodile, or escape; wasting energy.

Meanwhile, fish, birds, and smaller animals offer easier meals with less risk.
Predation does happen, but mostly when capybaras are young, sick, or isolated. Otherwise, crocodiles simply pass.
In the wild, survival isn’t about who’s stronger—it’s about who’s worth the effort.