Crossword puzzle clue "it can have a tail but never legs"

It can have a tail but never legs

"I go on four legs in the morning, on two legs in the afternoon, and on three legs in the evening ..."

Some have two arms and a tail, but no legs

Never, never, never

They have legs but no arms

Something that has legs but can't walk

Source of the maxim "Four legs good, two legs bad"

It may have a head but not a tail