cannot render a specific aminal

I'm trying to render a desert scene with a "gila monster" as my main focus. This is a well know desert lizard lizing in the southwest desert of the US. Firefly always renders a Godzilla type monster that's larger than mountains and taller saguaro cactus that's in my rendering.

The same goes with rendering most specific birds. Hope in the near future this can change.

Kind regards,