[quote=@Rtron]
<Snipped quote by Lugubrious>

Flighty and reclusive they may be, but some of them have had to die. They gather where humans gather right? With humanity pushed back, that means some settlements have been wiped out. The Dyun have rudimentary planning skills, such as 'surround place and kill everything.'

Even the most twitchy of people/animals/what have you, get caught off guard. 

[/quote]

Not when your number-one feature is excellent vision, and when you've got superhuman speed and agility.  The were designed to be more like ghosts than people or animals.

Still, a few of the slowest and dullest probably have been killed, yeah.  The species grows stronger for their loss.