Is the Irish wildlife is an untapped resource for making Ireland more green?

When we think of a environment sustainability, we always think about renewable energy. Wind power, the sun, the sea etc.. I really feel like we could do more than that by tapping into our natural wildlife. Why can't we use wild animals to help us obtain our environmental objectives?

For example:

Netted fish in farms could be used to create currents and electricity

Breed deer that will roam on a kinetic floor that generates electricity

Train wild birds to eat cigarette butts and other small rubbish (Lots of interesting work done on training crows:

https://www.youtube.com/watch?v=s2IBayVsbz8)

If we expand our thinking, there's definitely an opportunity to make the country greener