One day while Brother Bear is hunting bullfrogs, he finds a tiny, muddy kitten instead, and when he takes it home and introduces it to Mama, Papa, Sister, and the family dog, they all decide to keep it.

When the Berenstain family wakes up feeling grumpy, a little laughter changes everything.

"Sister Bear has made it to the school spelling bee! Papa Bear is very proud and excited to help her practice...and practice...and practice.... But will all of this p-r-a-c-t-i-c-e take all of the f-u-n out of spelling for Sister?"--p. [4] of cover

Sister Bear loves taking care of her pet goldfish, Goldie. Sister feeds Goldie every morning and evening, cleans out her tank, and even gets her a beautiful fishbowl castle! But when Papa and Mama find Goldie floating belly-up in her tank, they worry about how Sister will feel. How will the Bear family cope with the loss of Goldie, the best goldfish in the world?

Rhyming text examines the prehistoric world of the dinosaurs and the early mammals and birds that followed them.