Like air.

from Sylvia Plath – Lady Lazarus on Rap Genius

Meaning

Chameleons were said to eat air and subsist off it. Here, Plath is envisioning herself transformed— a phoenix, a chameleon. Chameleons were the great transformers; their skin changes color to blend into their surroundings. Death too is a transformer, coming in many guises and eating men like air. There’s a conflation between the speaker herself and the figure of death at the end.
The linkage of poet and chameleon is not new. Compare Shelley’s poem, ‘An Exhortation’, which begins thus:

“Chameleons feed on light and air:
Poets' food is love and fame:
If in this wide world of care
Poets could but find the same
With as little toil as they,
Would they ever change their hue
As the light chameleons do”

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