Cryptic words

As Dr. Harris packed away his gloves and tools, Kathy asked, “Do you really not know what they are?” He paused mid-motion, his back stiff. “I… have an idea,” he admitted softly, “but until I can be sure, I’d rather not say. For everyone’s sake.” Kathy frowned, confused by his cryptic words. He didn’t elaborate further, only nodding at the hatchlings still curled up in her lap.
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