I have inherited 6 birds from someone who no longer wanted them and hadn't been looking after them great.  They all seem to have bare abdomens and smelly messy vents.  I have attached a photo.  Is this vent gleet?  They seem mostly active but I've only had them 12 hours so not watched them for too long.
	
		
			
		
		
	
				
			
	
			