Smart vacuum cleaners

Read in The Guardian that the lions at a safari park in the UK are chasing SMART cars - they were described as 'those cars that look like vacuum cleaners without the stick'. I just have visions of trying to push one of those around my floor to clean up after the dogs!! The lions have taste though, why chase boring cars - at least with a Smart car they stand a chance of being able to roll it over if they pounce - and frighten the occupants to death in the meantime...