With no explanation, label text_A→text_B with either "not-entailed" or "entailed".
text_A: According to Parmesan 's earlier studies , one extinction event , for instance , was triggered when a checkerspot population migrated north prematurely , relying on a warming temperature signal , then was caught in a severe snowstorm in its northern habitat .
text_B: The catching did not happen
not-entailed.