Sphaerotheriida
... that millipedes in the order Sphaerotheriida roll up into balls the size of a cherry, a golf ball, or even a baseball when disturbed?
... that <a href="./Millipede" id="mwHrk" rel="mw:WikiLink" title="Millipede">millipedes</a> in the <a href="./Order_(biology)" id="mwHro" rel="mw:WikiLink" title="Order (biology)">order</a> <b id="mwHrs"><a href="./Sphaerotheriida" id="mwHrw" rel="mw:WikiLink" title="Sphaerotheriida">Sphaerotheriida</a></b> <i id="mwHr0">(pictured)</i> roll up into balls the size of a <a href="./Cherry" id="mwHr4" rel="mw:WikiLink" title="Cherry">cherry</a>, a <a href="./Golf_ball" id="mwHr8" rel="mw:WikiLink" title="Golf ball">golf ball</a>, or even a <a href="./Baseball" id="mwHsA" rel="mw:WikiLink" title="Baseball">baseball</a> when disturbed?