Two Hyenas at Denver Zoo have caught Covid.
The pair aged 22 and 23 are expected to make full recovery.
It is the first time Hyenas have been recorded with Covid, although 11 lions and two tigers at the zoo have previously tested positive.
Zoo officials said the hyenas – 22-year-old Ngozi and 23-year-old Kibo – had mild symptoms including slight lethargy, some nasal discharge and a cough.
The other animals that tested positive in recent weeks had either fully recovered or were on the path to a full recovery.
Covid infections have been reported in multiple species worldwide, mostly in animals that had close contact with a person infected with Covid-19.
As a guide experts believe humans with Covid-19 should avoid close contact with animals, including pets, to protect them from possible infection.