Gulls are reknown for amusing antics, hitching a free ride on a slow moving vehicle is not that unusual in towns where gulls are common.
The free rider principle is an interesting idea in economics. People may enjoy public goods without contributing to their cost, either because it’s too hard to enforce individual contributions or because they believe someone else will pay. This can lead to underfunding or inefficiencies in the production of public goods, such as parks funded by taxes.