Reptile's lip snarls, seeing winged creature (11)

I believe the answer is:

pipistrelle

I'm a little stuck... Click here to teach me more about this clue!

'winged creature' is the definition.
The definition and answer can be both animals as well as being singular nouns.
Perhaps there's an association between them I don't understand?

'reptile's lip snarls' is the wordplay.
'snarls' indicates anagramming the letters (I've seen 'snarled' mean this (to snarl can mean to entangle or twist)).
'reptiles'+'lip'='reptileslip'
'reptileslip' with letters rearranged gives 'PIPISTRELLE'.

'seeing' is the link.

Can you help me to learn more?

(Other definitions for pipistrelle that I've seen before include "Type of bat" , "Small variety of bat" .)

I've seen this clue in The Everyman puzzle in The Observer.

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