@Joe94
All good suggestions above about the pond and its value to the wildlife ~ good for you & your dad in improving the garden 'facilities' with the wildlife in mind.
In case I missed it being mentioned.............in the event of the likes of a Hedgehog getting into the pond you need to provide a ramp that runs from the bottom of the pond to top edge for such creatures to be able to climb out and away. Not doing so does put them at risk of drowning
A common example of a ramp is a piece of wood e.g. 4inches wides x approx min 1/2 inch thick with grooving scored into it across the width and all the way along the length to need to use in your pond. The grooving provides some 'purchase' for their paws/claws to grip on to exit the pond.
All the best with your garden wildlife venture