 Their main tunnels are used for feeding and for escape : they can dig themselves underground very rapidly , and can move along existing tunnels at high speed both forwards and backwards . Their digging technique is to force the soil to either side with their powerful , shovel @-@ like forelimbs , which are broad , flattened , toothed and heavily sclerotised ( the cuticle is hardened and darkened ) . 
 Their main tunnels are used for feeding and for escape : they can dig themselves underground very rapidly , and can move along existing tunnels at high speed both forwards and backwards . Their digging technique is to force the soil to either side with their powerful , shovel @-@ like forelimbs , which <a href='drop_aux' title='1'><mark>are</mark></a>broad , flattened , toothed and heavily sclerotised ( the cuticle is hardened and darkened ) . 
Their main tunnels r used fa feedin and ffirescape : they can dig theyself underground very rapidly , and can move along existing tunnels at high speed both forwards and backwards . Their digging technique is to force da soil to either side wit their powerful , shovel @-@ like forelimbs , which broad , flattened , toothed and heavily sclerotised ( tdacuticle is hardened and darkened ) .