You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "how long does it take for a blue whale to give birth?" whose answer is 10 to 12 months.
Each document should contain about 30 words, and these documents should contain useful information.

Query: blue whale gestation period
Useful Output:

Doc 1: Calves are not born every year, but rather at intervals of two or three years, and blue whales have a gestational period of twelve months. When
Doc 2: While most typically last 10 to 12 months, pilot whales experience a more extended gestation period, usually between 12 and 15 months.
Doc 3: That means that blue whales are pregnant for 12 months or around 365 days. Female blue whales reach sexual maturity as young as five years old,
Doc 4: The average length of gestation is 11.5 months, or 350 days. Increase in TL is linear in the late fetal period, and continues at the same rate
Doc 5:  gestation period of about one year. Calves can weigh up to 3 tons and measure nearly 25 feet at birth. Due to their highly migratory