https://www.msn.com/en-us/video/other/milwaukee-county-zoo-prepares-to-give-50-animals-covid-19-vaccine/vi-AAQw5Ue
https://www.nationalgeographic.com/animals/article/bears-baboons-tigers-are-getting-covid-vaccines-at-zoos-across-the-us
https://nypost.com/2021/11/08/two-hyenas-at-denver-zoo-test-positive-for-covid-19/
https://www.nbcbayarea.com/investigations/cats-and-dogs-top-list-of-covid-19-infected-animals-in-u-s/2625085/