Thanks @chestnutia for the first three facts and 1warriorcatfan for the fourth!
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-Mapleshade also trained Goosefeather.

-Goosefeather was made an apprentice before he was six moons old - four moons to be exact.

-Hailstar's warrior name was Hailstep.

-Goosefeather was warned of every prophecy in the series at four moons old.

-Juniperkit and Dandolinekit were Squirrelflight's dead kits.