"Life is a zoo, literally, for twin sisters Ava and Rosie when their family moves to the Fieldstone Zoo. Now the zebras seem upset and a pregnant pronghorn has gone into hiding. Will the twins' knowledge of animal behavior help them solve the mystery in time for the arrival of the pronghorn babies?"--Back cover.
Discusses how the pronghorn, once numbering 50,000,000, was reduced to 12,000 by the settlers' westward expansion, and then, with man's help, made a remarkable comeback.
With colorful photographs and lyrical text, follows a herd of Wyoming Pronghorn antelope on its age-old migration from the sagebrush desert in the spring, to the high-mountain country in the summer, to lower elevations in the winter.