Adapted like frogs, say, in cold temperature: different in shivering mice (11)

'adapted like frogs say' is the definition.
The answer and definition are not the same part of speech. However, past participle verbs and adjectives occasionally mean the same thing.

'cold temperature different in shivering mice' is the wordplay.
'cold' becomes 'C' (abbreviation, eg on taps).
'temperature' becomes 't' (abbreviation).
'different' becomes 'other' (similar in meaning).
'in' means one lot of letters goes inside another.
'shivering' indicates an anagram.
'c'+'t'+'other'='ctother'
'mice' anagrammed gives 'emic'.
'ctother' going within 'emic' is 'ECTOTHERMIC'.

'in' acts as a link.

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