In Longman's advanced grammar book the rule says 'The form of the present simple verb only changes after he, she or it, when we add -s to the base form (-es after o, s, sh, ch and x; -ies when the base form ends in -y)
In an example : A colony of Antarctic penguins lives in Marwell Zoo.
My understanding : add 's' only if he, she or it is present
My question: is 'A colony of Antarctic penguins' considered as 'it'? Or am i missing something else?