Hello Dafydd, this is my first post, so please bear with me... If keeping Peafowl in an aviary, do take into account that they will need to have access to plenty of both sun and shade, but need to be sheltered from winds and draughts. Ideally, the ground should have good drainage, too.When it comes to size of aviary, the bigger the better... the minimum size for a pair can be 4 metres by 4 metres by 2 metres high. Thats for the 'usual' Indian Blue Peafowl. If you want a pair of Green Peafowl, or a trio of Indian Blue, then the aviary needs to be at least 8 metres by 5 metres by 2 metres high.