"bioraptors" from 2000's Pitch Black

Bioraptors, loved them at first sight...and in my universe, there's a species closely akin to them on Shadowfall.

BUT, they are rather different in some ways, and actually approachable, to a degree. They are Nocturnal, but not burned by the sun. They are a species that is very motivated by curiosity, and will happily investigate a campsite...but are somewhat skittish.

If the Bioraptors (monster baddies) in Pitch Black are completely blind except for very powerful echolocation but, are hurt by any light, then how do they know where their is and isn't light? For example when the eclipse happens the monsters all come out. Are we supposed to believe they would just check for pain every few minutes? Also in many of the final scenes the monsters flee from light but they would have little to no context for what direction to flee or what caused the pain. Last they are supposed to live underground so we would have to assume they would retreat back there when the eclipse ends except they would have no context of if there is or isn't light underground to hurt them. It would be the equivalent of taking a blind dog, putting it in an open field, and raining acid continuesly on the field. The dog would have no ability to find shelter other than blind luck. (budum tiss) They seem like in reality they would be an evolutionary failure and would quickly die out.usps tracking