I think its because with hurricanes they destroy their habitats and their food supply making it harder for the animals to hunt and live. This cause them to force adaption meaning they are forced to find a new habitat to live them. With that the animals are affected with slow decomposition. It is hard for animals to find a new habitat or adapt to a new place because they are so use to different temperatures like for example if an animal is use to being in the cold like polar bears in the artic and with the artic melting they are forced to live in the warmer climates which is hard for them so they slowly die. Thats how the animals are affected during hurricane Katrina.
Hope this helped.
