‘A sloth of bears’ seems a little unfair, though a variant is a ‘sleuth’ which might apply when they manage...

‘A pace of asses’ can be seen in a small corral in the centre of our village.   The same collective...

‘A singular of boars’ – a singular collective noun if ever I saw one.

‘A cete (or set) of badgers’ – until I saw it written, I assumed that ‘set’ was the only spelling. ...