jean leon vallet , 24 , and his cousin jean mickael batrikian , 18 , pleaded guilty to animal cruelty after footage emerged of the pair lighting the quokka on fire with an aerosol can and a lighter on rottnest island on april 3 .
the two french tourists charged with setting fire to a quokka have been released from jail after spending a week behind bars .
the french men opted to serve the seven days in hakea prison rather than pay the fine .