Silence is golden- sometimes

Why it is that
foolish people are compared with donkey
and not with
cow, zebra, giraffe or monkey
methinks,
the answer is simple
as you may say
both don’t know
when to keep mum and when to bray.
( No offense intended for donkeys, they are lovely and hard-working. They are just stubborn, single-minded and will go to extreme lengths to get what they want, especially when someone indicates “No, you can’t have this. “)