They dig for grubs and worms. The young ones more than the adults, it seems. They also dig if they smell something, or at times seemingly out of curiosity e.g. if something has changed in the garden, such as a new plant has been planted, let's have a dig and see if there is anything interesting in there.
I've had many new plants destroyed in this way. I actually gave up gardening for a few years as it was so depressing to come down in the morning and find your new plants ruined.
They dig for grubs and worms. The young ones more than the adults, it seems. They also dig if they smell something, or at times seemingly out of curiosity e.g. if something has changed in the garden, such as a new plant has been planted, let's have a dig and see if there is anything interesting in there.
I've had many new plants destroyed in this way. I actually gave up gardening for a few years as it was so depressing to come down in the morning and find your new plants ruined.