Hundreds of volunteers are taking to beaches around Wales as part of this year's national Beachwatch Big Weekend.
Rubbish found will be cleaned up and recorded, with the data collected helping to shape future beach litter campaigns.
Items found on UK beaches during last September's Beachwatch Big Weekend included a life-sized fake donkey, a portable toilet, a roadside bollard, a plastic skeleton and a Smartie tube lid from the 1970s.
But more unpleasant discoveries often include syringes, sanitary waste and faeces.
The Marine Conservation Society - the charity set up to help protect our seas and shores - says Welsh wildlife is under threat from discarded litter.
Beachwatch is part of the International Coastal Cleanup, which takes place in over 100 countries and regions worldwide.