These sick people initially suspect bugs on lamb (5,5)

'bugs on lamb' is the definition.
The definition and answer can be both animals as well as being plural nouns.
Perhaps you can see a link between them that I don't see?

'these sick people initially suspect' is the wordplay.
'initially' says to take the initial letters.
'suspect' indicates an anagram (a suspicious or unusual spelling).
The initial letter of 'people' is 'p'.
'these'+'sick'+'p'='thesesickp'
'thesesickp' with letters rearranged gives 'SHEEP TICKS'.

Can you help me to learn more?