New aviary block

For conures, black cockatoos, lorikeets and macaws. The space in the middle of the block will become a covered aviary for other tropical species.

Update 3rd July 2020. The central aviary is nearly complete, but it will presumably need planting up, so it will take a while before it is ready. The shelter block extends beyond the three aviaries behind the central one, so there is extra space for at least one larger or two smaller flights.