The former actress and activist also shared her hope for raising awareness about the plight of the animals: "I hope that when people see this film they realise how connected we all are, and if we had more of an awareness about the obstacles we're facing, I think we'd take care of each other, this planet and animals in a very different way."
Markle, who provided her voiceover services for a donation to wildlife charity, is officially "off-duty" and now living in Los Angeles with husband Prince Harry and son Archie.
The couple was last week seen delivering food to the needy around the city and have been supporting the local charity Project Angel Food.
The source told Page Six: "They've actually volunteered a few times. What's so lovely is that the organisation has now seen an uptick in donations, many of which people have been making in honour of (their) baby, Archie's, first birthday on May 6. This makes Meghan and Harry so happy as it's something so meaningful for his birthday that they will otherwise have to spend in lockdown."