I couldn't find a birdbath large enough for my two macaws, so I made this one based on a decorative "butterfly" bath I saw an artist from SF do on the DIY channel.
1
For bath base: find 2-3 terra cotta pots that stack nicely (and securely). Glue in place using a permanent adhesive like Liquid Nails.
2
So that the basin will hold water, you'll need to patch the drain hole in "bowl" using a permanent concrete patching compound.
3
A self-adhesive fiber wall repair tape comes in handy (holds the patching compound in while it dries).
4
Wipe the basin surface clean and dry (I use rubbing alcohol), read all directions for patching compound, apply repair tape and a thin coat of patching compound to bottom of basin.
Allow to dry (about 10-15 minutes).
5
Fill drain hole from inside basin with patching compound.
6
Wipe away any excess.
Allow patching compound to dry completely and cure for 24 hours to a week (depending on weather and type/brand of compound used) before filling with water.
7
I chose NOT to glue the top onto my base, to allow for easier cleaning and disinfecting of the basin.
You could also leave the drain hole open and insert a pump for water circulation (my birds would eat it...).
8
Add water, bird and enjoy!