The Petulu Heron Colony is a little way out of Ubud but is a great place to come if you are looking for an interesting day trip.
This little village is known for the herons that fly in every evening to settle down in the trees for the night, and there is a slightly eerie feel to the proceedings as the birds are meant to be sacred and represent the souls of the dead.
Still, if you like wildlife then this interesting natural spectacle is a must-see in the Ubud area.
(Source: https://www.thecrazytourist.com/25-best-things-ubud-bali)