Here are a few starting places for finding your popular science article.
Remember: Science Daily, publisher/university press releases, and reviews published in science journals are NOT acceptable popular science articles. The intended audience of the popular science article should be the general public.
These three sources are best if you know the animal you want to research. I recommend searching by the animal name and then the term one of these terms: researcher, scientist, or study; for example: axolotl AND scientist. (When using this method, double check that your popular science article is recent enough (published within the last year).
These sources are best if you are open to an article about any type of animal and just want to find something recent. These sources regularly post popular science articles, often about animals. You can go in and skim them and see if anything catches your interest.
While, hopefully, your popular science article will have a direct link back to the research, you may need to do a little investigation to find the scientific article. These sources index scientific research and may provide links to the full text.