05/22/2026
Update on Basil, the stowaway fox.
We are pleased to share that the stowaway red fox that was discovered aboard a cargo ship from Southampton, England, is healthy and has completed quarantine. The two-year old, male red fox was successfully treated at the Bronx Zoo for a parasite commonly known as the “French heartworm.”
After his arrival at the zoo, the red fox—now named Basil—underwent a comprehensive veterinary evaluation at the zoo’s Wildlife Health Center where he was diagnosed with the parasite. French heartworm is rarely seen in the United States. It is more commonly associated with wild foxes and domestic dogs in Europe and can cause severe respiratory disease if left untreated. Over the course of approximately one month, Basil received three types of deworming medication as part of a carefully managed treatment plan. Throughout his treatment, Basil showed significant improvement. He gained weight, developed a fuller and shinier coat, and demonstrated strong overall health during follow-up examinations. When Basil arrived at the Bronx Zoo, he weighed 11.2 pounds (5.1 kg). He now weighs 13.7 pounds (6.2 kg), a gain of approximately 2.4 pounds (1.1 kg).
We will assess the most appropriate long-term placement for Basil now that he has completed quarantine. Follow us for more updates about Basil’s rescue and recovery story!
