I once froze (in an attempt to euthanize them) Polyrachis dives for a full day and they survived.Also you cannot put tropical ants into a fridge, they have no way to deal with colder temperatures they never experience in the wild and they will just die.
They do have a way of dealing with it because they are insects. It’s called diapause. I understand that the species wouldn’t experience it in the Philippines. But they are still insects that have the ability to enter that diapause.
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