Originally I had 6 keets, 2 royal purple, 1 lav, 3 grays. I used the different colored leg rings to identify them once the grandson finished naming everyone. The rings are long gone now. I' d find them snapped apart in the yard. But by then I was able to tell them apart by a combination of sound, appearance, & personality. Now I recognize "voices" w/o even looking. Nugget sounds like a duck quacking, PJ has a deeper tone, etc. One of my female keets sounds like she has a horrible head cold. LolHow do you guys know your guineas apart? I can only tell my lavender guineas from the pearl grays. I used to name them when I only had like 5 but now with 15+ I can't keep track of them lol.