For my story about 12,000 Americans being dropped into an alien planet's desert, I have massive pack predators (Think the Withespikes from The Tomorrow War, but not as hungry, big, or with ranged weapons) that are nocturnal. However, the only reason why is because a diurnal species of massive ant-esque creatures, called Emali, attack and eat the predators if they are out at day.
The features of Emali are:
The size of bulldogs for a worker, German shepherd size for soldiers, and the size of an elephant for the (Mobile) queen.
Have a hive mind, so that workers and soldiers will die protecting the queen.
The queen has 3 pairs of pillar legs and a pair of pincers for eating.
Soldiers can shoot acid out of their tails every 4 hours.
If you have not watched The Tomorrow War (It's an Amazon Original, pretty nuts), don't worry, I have basic facts:
Big, probably rhino sized.
Fast, can swim and climb like nuts, and can glide.
Essentially bulletproof, except on the neck and belly.
Has claws, teeth, and tentacles to shoot spikes (Being modified for not shooting, only stabbing), and can jump.
Males will die protecting their female.
Every 7 days, they all go silent, observing a sort of Sabbath.
I'd like to know how the Emali can kill Whitespikes easily and fast enough to keep them nocturnal. However, both operate as horde killers: They hunt in huge packs. The Emali are most likely small enough to be swallowed whole by a Whitespike, particularly a worker. My question is this: How do the Emali keep the Whitespikes a Nocturnal species?