I am looking for a large, oversized children’s picture book that I read between 1973 and 1976. It was an anthology containing many stories. One story I remember clearly featured two zebras — a father and a son — who would race each other. The young son could never beat his father, until one day he finally did. The book may have been published in the 1950s or 1960s. Any help identifying either the specific zebra story or the anthology it appeared in would be greatly appreciated.