Resource-heavy. You've a talent for understatement. The feeding requirements alone for a creature of that size would be immense, to say nothing of space and other specialized care. You mentioned selective breeding, so there must also be facilities for incubating the eggs and raising the hatchlings until they're grown enough to be safely integrated. I doubt you know the particulars of hatching? I know of no successful attempts, nor of anyone who has observed it in the wild. A firsthand account would be useful.
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