The “Naturalist” refers not to an actual scientific expert, but simply an inquisitive child.
The death referred to is metaphorical; the loss of innocent enthusiasm in response to half-understood realities.
The metamorphosis of the tadpoles into frogs is a metaphor for the change in the child’s perceptions and the awakening of sexual awareness.
The break or volta, where the child loses innocence and becomes aware that life is not so simple, comes at the beginning of line 22, with ‘Then’.
There is no regular rhyme scheme or metre, but instead Heaney uses enjambment, varied sentence length and varying pace to convey the nuances of the story.
just how quickly can curiosity passion and obsession die let's find out