ing ▁and ▁bre eding ▁stop ▁for ▁mig rat ory ▁birds ▁along ▁the ▁Pacific ▁Fly way . ▁Once , ▁the ▁season al ▁bird ▁populations ▁in ▁the ▁San ▁Jo aqu in ▁bas in ▁were ▁immense , ▁especially ▁in ▁the ▁now - d ry ▁Tul are ▁Lake ▁region : ▁" It ▁took ▁something ▁different , ▁though , ▁to ▁capture ▁the ▁sound ▁of ▁the ▁blue ▁sky ▁as ▁it ▁turned ▁dark ▁and ▁de af ening ▁from ▁the ▁wings ▁and ▁c ries ▁of ▁millions ▁of ▁native ▁and ▁mig rat ory ▁birds ▁– ▁Canada ▁ge ese , ▁m all ards , ▁sw ans , ▁pel icans , ▁c ran es , ▁te al , ▁and ▁cur le ws . ▁How ▁to ▁m im ic ▁the ▁sudden ▁flight ▁of ▁f lock s ▁so ▁immense ▁they ▁ex ting u ished ▁the ▁sun ? ▁One ▁of ▁the ▁first ▁white ▁men ▁to ▁camp ▁along ▁the ▁lake ▁could ▁think ▁of ▁only ▁one ▁noise , ▁the ▁ro ar ▁of ▁a ▁fre ight ▁train , ▁that ▁compared ▁with ▁the ▁take off ▁of ▁the ▁birds ." ▁Histor ically , ▁the ▁grass lands ▁and ▁the ▁fr ing es ▁of ▁the ▁great ▁mar sh es ▁and ▁la kes ▁provided ▁habitat ▁for ▁large ▁gra zing ▁animals ▁including ▁pr ong horn , ▁m ule ▁de er ▁and ▁the ▁en demic ▁t ule ▁el k , ▁as ▁well ▁as ▁pred ators ▁such ▁as ▁the ▁San ▁Jo aqu in ▁k it ▁fo x ; ▁all ▁of ▁these ▁species ▁have ▁seen ▁dram atic ▁population ▁decl ines ▁as ▁their ▁native ▁habitat ▁has ▁fallen ▁under ▁the ▁p