Can birds be potty trained? IJ mean like dogs where they scratch the door to be let out or use a box to do their business, that sort of thing.
No.
You can train them to wear chicken diapers or nappies but only as adult birds. When we were nursing a very badly injured chook back to health after a nasty fox attack, we did train her to wear a chicken nappy, but each one is hand made and custom fit to the bird. It had a liner that you'd just empty periodically. (She wasn't lagging eggs because if the trauma of the injury.) However for chicks they are rather like babies of all types. They eat, they shit, and they grow exceptionally quickly. 4 of the 6 are of a breed that grows exceptionally fast. The other 2 still look like newly hatched chicks compared to these 4. but we can't separate them because they need company and if one of those pair is a cockrel, it will leave a lone pullet by herself if we separate the 2 that are not maturing as quickly.
So all rugs and carpets have been rolled up and we've got the immediate area surrounding the cage covered in puppy trainer liners. Their cage, both levels, is also lined with puppy training liners and the ones up top where they eat and sleep get changed daily. The ones down below get changed every other day and we have a dedicated scrubber sponge for cleaning up the less solid craps (chooks don't urinate). The mud room is usually full of crap that's been trodden into the house anyway so we're not unfamiliar with the routine.
The plan, weather permitting and more importantly the more immature of the 6 chicks permitting, is that they will have longer periods outside (which we've already started with) and at some point this week we'll put their cage into the mud room as the first step to getting them outside permanently. Normally mum would keep them warm for at least the first 6-8 weeks. We're only at week 3. But with the weather forecast, outside overnight might be too cold for them even with a heater in the cage for another couple of weeks.
So we take it in turns as to who cleans up unless hubby has taken the day off and gone into the office.
They are at the stage of managing an hour outside without heat if the temperature is around the 25°C mark. We're not due that temperature again this coming week. In fact having checked the forecast, we're not going to reach 20°C all week with as low as 7°C night time temperatures, so I suspect I'll have to move then to the mud room for a while. It won't deal with the daytime issues but will start to acclimatise them to not having us around all the time.