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The text is a personal message from someone named Diego, who is writing to their mother. Diego mentions that their time in San Diego went well and they had a great time visiting the zoo, going deep sea fishing, and exploring the city. Diego also mentions that they will be participating in a triathlon soon. The text ends with a mention of a gorilla and the addresses of the San Diego Zoo and Wild Animal Park. The focus of the vintage postcard is likely on the San Diego Zoo and the animals found there.