I think you are talking about this thread???
http://www.birdboard.com/forum/thread332.html
People do post a lot here, so threads may dissapear easily!
You know, I might have to expand my address! LOL Thanks for the suggestion!
Fids means 'feathered kids', or 'furry kids', depending on which way you look at it. There is also Fildren, which means "feathered children"!
And yes, I did say 'All budgies are parakeets but not all parakeets are budgies'. What I mean by that is that those little birds that people call 'parakeets', their true names are budgies, or budgerigar. Parakeet just means a small parrot with a long tail, which includes everything from parrotlets (not sure how), to cockatiels, ringnecks, and conures and quakers. It does not include lovebirds, though. I own a cherry head conure, a cockatiel, 4 budgies, and two bourkes. Scientifically speaking, I own 8 parakeets, but only 4 of them are actually budgies. Budgies also come in two breeds, 'English' or 'Show' budgies, and 'American' or 'Normal' budgies, however they are all from Australia. It's just to tell the difference between the two breeds, as the english budgies were bred to be much larger and to be able to raise their crest. Some people/petstores call the english budgies 'Budgie', while the smaller normal budgies as 'parakeets'. It can be really confusing...
Another way of saying that phrase is to say: "All zebras are equines, but not all equines are zebras." Equine basically means having the characteristics of a horse, and of course not all horses are zebras. Equines also includes donkeys.