The Yellow Bloon is a Bloon that appears in all the Bloons Tower Defense series, Bloons series, BSM series and Bloons Monkey City. They usually appear in Round 11, and are the first real threat encountered by most players. They are the fastest out of all the Bloons in BTD1, BTD2 and BTD3, the second fastest Bloons in BTD4 and BTD5 following the Pink Bloons, and also the second fastest in BMC, behind Pink Bloons and D.D.T.'s (who are the same speed). Yellow Bloons are the parents of Green Bloons, the grandparents of Blue Bloons, and the great-grandparents of Red Bloons. The parent of the Yellow Bloon are Pink Bloons (BTD4 onwards) or Black Bloons (before BTD4). When a Yellow Bloon and its children are all popped, it yields a total of $4. Yellow Bloons also appear in the Bloons games, but only take one hit to pop.