Snake's Spectacles
The eyes of snakes are covered by a permanent horny membrance, a transparent lens through which they can see as we see through glass or mica. Birds have a sort of inner third eyelid, a winking membrane, which is repeatedly drawn across the eyeball, thus keeping the eye swept clear of dust, and at the same time moistened.
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https://paperspast.natlib.govt.nz/newspapers/BPB19480331.2.42
Bibliographic details
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Bay of Plenty Beacon, Volume 12, Issue 33, 31 March 1948, Page 8
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60Snake's Spectacles Bay of Plenty Beacon, Volume 12, Issue 33, 31 March 1948, Page 8
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