ity . ▁ ▁Ac worth ▁published ▁some ▁id ios ync r atic ▁views ▁on ▁bi ological ▁matters . ▁He ▁claimed ▁that ▁birds , ▁and ▁other ▁aer ial ▁migr ants ▁such ▁as ▁but ter f lies , ▁do ▁not ▁migr ate ▁purpose fully ▁over ▁particular ▁routes , ▁but ▁w ander ▁aim lessly , ▁their ▁apparent ▁routes ▁a ▁result ▁of ▁the ▁prev ail ing ▁wind s ▁at ▁different ▁seasons . ▁He ▁also ▁believed ▁that ▁par as it ic ▁c uck o os ▁are ▁hy br ids ▁between ▁male ▁c uck o os ▁and ▁the ▁females ▁of ▁the ▁host ▁species . ▁ ▁Re ception ▁ ▁His ▁book ▁This ▁Bond age : ▁A ▁Study ▁Of ▁The ▁" M igration " ▁Of ▁Bird s , ▁In sect s , ▁And ▁A ircraft ▁received ▁positive ▁reviews ▁in ▁two ▁science ▁journ als . ▁For ▁example ▁the ▁British ▁Medical ▁Journal ▁described ▁it ▁as ▁a ▁" ch arm ing ▁work ▁that ▁will ▁be ▁wel com ed ▁by ▁all ▁his ▁fellow ▁bird ▁lo vers ▁for ▁the ▁very ▁clear ▁ex position ▁which ▁it ▁contains ▁of ▁the ▁principles ▁of ▁bird ▁flight ." ▁A ▁more ▁critical ▁review ▁in ▁The ▁A uk ▁critic ized ▁the ▁book ▁for ▁trying ▁to ▁dis cred it ▁the ▁evidence ▁for ▁evolution ▁and ▁noted ▁that : ▁ ▁He ▁fails ▁to ▁take ▁the ▁physical ▁fact ▁of ▁in ert ia ▁sufficiently ▁into ▁consideration , ▁nor ▁does ▁he ▁grant ▁to ▁most ▁birds ▁the ▁superior ity ▁over ▁normal ▁meteor ological ▁conditions ▁which ▁they ▁und ou bt edly ▁have . ▁He ▁builds ▁up ▁an ▁elaborate ▁theory ▁in ▁which