I'm not quite sure of what I think about polyamory.
They say that around than 3 - 5% of mammals are monogamous.
These are Prairie Voles, they are known to be monogamous, that is they have an exclusive mate for life:
These are Barn Owls, they are also known to be monogamous. The male likes to offer the female gifts of field mice during their 'affair of the heart' as a way to show his worth.
Some said monogamous animals of Australia are Kookaburras, Azure (or blue) Kingfishers (who are related to Kookaburras), Cassuaries, some possums, magpie-larks... it really goes on.
Cassowaries like to make shallow nests with leaves at the floor of rainforest canopies and it seems blue is their favourite colour.
And this my friends is a baby cassowary: