Sunlight absorbed by the wings of bats would cause an increase in the cost of flying in the light of day . Hunting days would be beneficial only if the energy gain is relative and that the elevated risk of predation is low . The authors propose an evolution of wing color to darker tones that would make the bat less detectable by predators, thus trapping bats in the darkness of the night .
Jua kufyonzwa na mabawa ya popo inaweza kusababisha kuongezeka kwa gharama ya kuruka katika mwanga wa mchana . Uwindaji wa siku itakuwa ya manufaa tu kama mapato ya nishati ni jamaa na kwamba hatari kubwa ya predation ni ya chini . waandishi kupendekeza mageuzi ya rangi ya mrengo wa tani darker ambayo ingeweza kufanya bat kasoro na predators, hivyo msako popo katika giza la usiku .