s ided ▁jack ra bb it ▁is ▁a ▁minimum ▁of ▁ 1 8 ▁weeks , ▁occurr ing ▁from ▁mid - A pril ▁to ▁mid - August . ▁The ▁average ▁number ▁of ▁young ▁per ▁l itter ▁is ▁around ▁two . ▁The ▁young ▁tend ▁to ▁have ▁a ▁soft , ▁w ool ly ▁coat ▁in ▁early ▁life ▁and ▁att ain ▁sexual ▁m atur ity ▁at ▁a ▁rapid ▁rate . ▁Bre eding ▁in ▁L . ▁call ot is ▁does ▁not ▁begin ▁within ▁the ▁first ▁calendar ▁year ▁following ▁its ▁birth . ▁ ▁Be havior ▁Most ▁activity ▁of ▁the ▁white - s ided ▁jack ra bb it ▁occurs ▁during ▁the ▁night ▁or ▁at ▁d usk , ▁particularly ▁on ▁clear ▁night s ▁with ▁bright ▁moon light . ▁Its ▁activity ▁may ▁be ▁limited ▁by ▁cloud ▁cover , ▁precip itation , ▁and ▁wind , ▁but ▁temperature ▁has ▁little ▁effect . ▁Its ▁escape ▁behavior ▁consists ▁of ▁altern ately ▁flash ing ▁its ▁white ▁sides ▁when ▁running ▁away . ▁The ▁white - s ided ▁jack ra bb it , ▁when ▁esc aping , ▁makes ▁rather ▁long , ▁high ▁le aps . ▁When ▁start led ▁by ▁or ▁al ar med ▁by ▁a ▁pred ator , ▁it ▁le aps ▁straight ▁up wards ▁while ▁extending ▁the ▁h ind ▁legs ▁and ▁flash ing ▁the ▁white ▁sides . ▁In ▁its ▁rest ing ▁position , ▁a ▁white - s ided ▁jack ra bb it ▁is ▁cam ou fl aged ▁with ▁its ▁surr ound ings . ▁The ▁long ▁h ind ▁legs ▁and ▁feet ▁are ▁adapted ▁for ▁speed , ▁giving ▁the ▁animal ▁lift