But what happens to the animals who are confined within a zoo during horrific conditions like this?

Floodwater rose to the rooftops of enclosures at the zoo, drowning hundreds of caged wildlife from around the world and releasing an unknown number of animals. Many of them were swept out of their enclosures and escaped. Officials have warned people to stay indoors to avoid the missing tigers, lions, bears and wolves.
Three lifeless people, two of them employees, were found within the zoo grounds, now become a hellish whirlpool.
A hippopotamus was cornered in one of the city's main squares and subdued with a tranquilizer gun, and helicopters are circling the city as part of a search and rescue operation. A bear was found clinging to an air-conditioning unit half way up one building, while a man discovered a hyena on his balcony. Wolves, lions, tigers, jackals and jaguars have been disposed of by special forces. Source: BBC News.

And, of course, I should mention my co-written futuristic post-apocalyptic fantasy Higher Ground series of novels, set after the Great Flood.
Five remarkable people—clever Aron, strong Boris, wise Cerridwen, attuned Trevly, and temptress Sasha—get caught up in a search for the legendary Egyptian jewelery.
Only memories, broken articles, and derelict buildings speak of a past civilization, among them a mural in Saint Eyes, buried under a sand dune, points the way to a better future.

Cameras, set up in various UK locations, film birds going about their normal activities.
What if every country in the world did the same and filmed animals in their natural surroundings? I think their effort would be very popular and earn them good revenue at the same time.
What is your opinion of restricting animals in zoo enclosures?