Cougar cubs Sienna and Sullivan continue to grow in both health and confidence. The latest weigh-ins show Sienna at about 60 pounds and Sullivan at 77 pounds. Although Sullivan is larger, both cubs are gaining weight at the same steady rate, a strong sign that each is getting exactly what they need from their balanced diet.

Since arriving as orphaned wild cubs, Sienna and Sullivan have undergone a remarkable transformation. Keeper Haley has had a front-row seat to their progress.

“Both Sienna and Sullivan have overcome so many challenges,” said Haley. “Sullivan adapted quickly and shows amazing resilience, even with new staff, habitat changes, or big events with crowds. Sienna has shown us that patience pays off, and we often see her comfortably relaxing on her high platform. Watching them gain confidence has been so rewarding.”

Haley says Sullivan eagerly participates in positive-reinforcement training (especially when snacks are involved) while Sienna impresses keepers with her focus during tasks and her growing willingness showing body parts on cue for care.

Both cubs enjoy their regular diet of ground meat and elk chunks, but their favorite treats are whole frozen rabbits and large elk legs.

Sullivan was rescued in March near Spokane, Washington, after being found alone, malnourished, and dehydrated. Sienna, rescued from New Mexico earlier this year, also arrived at Northwest Trek this spring.