Disturbing images of a squirrel wrestling with large plastic bags reveal the difficulty urban wildlife has coping with human litter. The squirrel was snapped by a photographer on a wall and may have been taking the carrier bags to help build its nest. This event may be the first direct evidence of the rodents using plastic litter in this way.In 2018 scientists discovered plastic in the nest of squirrels, indicating they had begun using plastic waste as a building material.