Yep the praying mantis eat others bugs! hoping they will eat the bad bugs and not the good ones! My garden is in a field a little bit a ways from the house and the chickens don't go out there, or very rarely- it doesn't have much of any where for them to get away from aerial predator's and it's hot so they stay closer to the house where there are lots of trees. I never got the praying mantis before and if I'd have known how long they took to hatch I would have had them shipped sooner.
Where do you buy them? Will they reproduce on their own? Can the eggs freeze?
Is their a Preying Mantis farm somewhere? Does the government have it's fingers in it some how?