En muchos de modernos, no hay jaulas anticuadas. los animales viven en corrales mã¡s naturales.

The noun that best completes the sentence is:

- En muchos de los zoológicos modernos, no hay jaulas anticuadas. los animales viven en corrales más naturales.

Explanation:

The translation of the paragraph is:

- In many modern zoos, there are no outdated cages. Animals live in more natural pens.

It is logical to identify that an animal in captivity feels better in an environment that emulates its own ecosystem, for this reason, many of the modern zoos have chosen to leave the animals in much wider delimited areas, where the animals do not feel the pressure of the confinement and survive for much longer, in some cases, when visits are to reserve areas, people enter a cage which provides the route, being the people who are locked and not the animals.

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