They actually rely on their daylight vision and cannot fly during the night with no moonlight.

实际上，它们依靠的是昼视觉，在没有月光的夜晚则无法飞行。

youdao

Owls often fly out at night. They can catch mice.

猫头鹰通常在晚上飞到外面觅食。它们会抓老鼠。

youdao

The bats are able to avoid other predators, and locate prey—typically insects that fly around at night.

蝙蝠能避开其他捕食者，找到猎物——通常是夜间飞行的昆虫。

youdao

The bats fly to nearby river valleys to feed on night-flying insects.

VOA: special.2011.04.11

Others are clueless and besieged by new-media providers--some legitimate, some fly-by-night--clamoring for their attention.

FORBES: Magazine Article

Land-grabbers who rented government plots illegally to fly-by-night shops, taking money that belonged to the city. (Mr Hamidi would burst into such places with shovel in hand, pushing people aside, shouting at them to clear their rubbish away.) And, over all these, the swaggering local powerbrokers who demanded their share of the opium trade, the military contracts and the building projects, like boys fighting for candy at a wedding.

ECONOMIST: Ghulam Haider Hamidi

Europeans often need to be persuaded that a youthful U.S. corporation is not a fly-by-night company.

FORBES: Innocents Abroad