, ▁the ▁cry st als ▁within ▁the ▁balls ▁m elt , ▁taking ▁in ▁the ▁heat ▁and ▁cool ing ▁the ▁building . ▁As ▁the ▁building ▁co ols , ▁the ▁sal ts ▁cry st all ise ▁again , ▁giving ▁out ▁heat . ▁In ▁this ▁way , ▁the ▁tank ▁helps ▁keep ▁the ▁temperature ▁within ▁the ▁centre ▁constant . ▁ ▁Form er ▁exhib its ▁▁▁ ▁Wild walk ▁- ▁Wild walk ▁was ▁an ▁E col ogy ▁Science ▁centre , ▁which ▁contained ▁two ▁artificial ▁rain for ests , ▁aqu ari ums , ▁hands - on ▁exhib its , ▁and ▁live ▁animal ▁exhib its . ▁The ▁centre ▁compr ised ▁a ▁large ▁building ▁( pre viously ▁a ▁lead - works ▁building ) ▁with ▁a ▁‘ l iving ▁rain for est ’ ▁attached ▁to ▁the ▁southern ▁side , ▁and ▁was ▁designed ▁by ▁Michael ▁Hop kins ▁& ▁Part ners . ▁The ▁centre ▁hous ed ▁animals , ▁including ▁but ter f lies , ▁c rab s , ▁ch ame le ons , ▁fro gs , ▁fin ches , ▁part rid ges , ▁pir an has , ▁se ah ors es , ▁sc orp ions , ▁sn akes , ▁sp iders , ▁tar ant ulas , ▁trigger fish : ▁in ▁total ▁over ▁ 1 5 0 ▁species ▁from ▁all ▁major ▁animal ▁groups . ▁The ▁botan ical ▁house ▁was ▁split ▁into ▁two ▁distinct ▁sections : ▁Pl ants ▁on ▁Land , ▁which ▁trac ed ▁the ▁development ▁of ▁plants ▁from ▁simple ▁m oss es ▁through ▁to ▁complex ▁flow ering ▁plants ; ▁and ▁Trop ical ▁For ests , ▁which