First, I will preface all my comments by saying the staff at OWK Scales are very accommodating and easy to work with. They have the "RIGHT ATTITUDE". They worked with me to find a scale that would really meet my needs and were happy to take the time to make it a very good buying experience. On my own before I actually talked with a Rep, I ordered 2 scales at different times that did not work suitably for me. They had no problem with me returning the first scale I purchased. I ordered a second scale, the i2500 w/Large Bird Rectangular Perch and that did not work well for me either. They also let me return that one w/o any problem and even sent me the third scale, the i2600 before they got the i2500 back. The "third scale was a charm" , the i2600 Model. I am a Contractor and Inventor so I made my own perch for it. The second scale I bought was the i12500 Avian Model, as it was advertised for birds. I have a Blue and Gold Macaw- a LARGE Bird, BUT the i2500 should be advertized w/several disclaimers in order to keep people from having to reorder a scale that is more appropriate, the i2600. Although it is 3 times the price- about $125w/S&H vs $40, the i2600 is the only way to go if you have a large bird and want accurate weighing or IF you need to have the 0.10g Resolution instead of the 0.50g Resolution as with the i2500. Either way, you will want to make the perch like I did. DO NOT waste money on their "T" Wood Perch- round or rectangle. The i2600 cost is about $5 per year over the 30 year warranty period. Who warrants ANYTHING for 30 years. To me, it must be GOOD! Maybe they need to get a local "Birder" to work w/them to improve their ad copy, assist in product development and information. Large birds to me are Macaws and Cockatoos. Medium birds would be like Amazons or Cockatiels and Small birds being Budgies, Parakeets etc. For a Small to a small-Medium bird the i2500 would work well except it only measures resolution of .5g. With Small birds in a health situation, the i2500 might not be adequate Resolution for daily monitoring. The ?Bird Perch? is a single wood vertical post, stuck on a metal rod connected to a thin aluminum plate attaching to the small round plastic platen (surface plate you put items onto for weighing) of the i2500. It is ONLY SUITABLE FOR SMALL BIRDS, in my opinion. Medium and Large Birds while on the perch- very rarely will they stay perfectly still and while balancing on the perch they HAVE to straddle the vertical post "Dead Center" and remain "Dead Still" , to get an accurate reading. A Large to Medium bird on a wobbly perch is not very likely to stand still. Small birds do not have the weight to transfer, thus they are very stable on the center-post perch. The Large Bird rectangular perch is of no help and actually causes the bird to move around more. How many of you out there actually keep your bird on a rectangular perch? Nobody I know- we all use "Round Perches". If a large Medium sized bird or Large bird is placed on the perch they will usually move to one side or the other and it can be really hard to get them to straddle the Vertical Post with equal weight on both sides of the post. This tilt-off to one side or the other, with the unbalanced download forces, acts as a lever on the vertical post. This force transfers weight unevenly to the Platen (surface plate you put items onto for weighing), thus you get inaccurate readings. The i2600 on the other hand has a much larger and heavier Platen made of metal. It resists the bird?s movement and twitching better, it has a Resolution of 0.10g and offers a very easy solution to the problem of a flimsy Center Post Perch when my modified perch is attached to the plate. Most every Birder is familiar with Polly's Pet Products Brand of Travel Perches and other useful items. www.pollyspetproducts.com They are the rough, cement-like round perches about 10" wide and are supported by two colorful plastic, triangular shaped sides, with the base sitting on a surface and the is perch connected on each side at the top of the triangle. You can use them around the house for a temporary perch. It's the one you see when you go to your Avian Vet, sitting on top of most of their exam tables. The model I used is like a circle cut in half with the flat side down on the platen and the perch is situated at the top of curved portion. I purchased a "Poly's Mini Stand Rocker, size "Extra Small" , with a 7/8" diameter perch 6" long. Product Bar code is 753323502866. Price is $15 w/S&H. Don't be misled by the "Small" description. 7/8" is plenty large enough for even a Hyacinth Macaw to stand on comfortably. They like to stand on the top of their cage door don't they and it's only 1/4"dia thick wire! The perch is 6" long from the factory. They have a wood dowel inside the masonry outer covering to receive the wood screws to attach it to the plastic side panels. I sawed off 1.5" of the length leaving me a 3.5" length for the perch. [ Bonus, I took the waste piece and ran a screw thru a small SS chain, then into the wood dowel and hung it next to one of Gabe?s swings. An instant hit as a new toy and something good for him to chew on and groom his beak.] I screwed the ends of the perch rod into the stand and it sits on top of the i2600 Plate with 1.25" clear on each side of the plate, centered front to back. I attached it to the plate by using a really neat adhesive. It is called "Stick To It!" , by Darice Inc at www.darice.com. My wife got it at Office Depot or Office Max for a couple bucks. It is a reusable, removable, all-purpose adhesive that is similar in feel to modeling clay or Play Doh. It can be rolled, molded and formed in your hand but will not stick to your hand. It is used to adhere objects to keep them in place from moving around but yet it peels right off w/o any residue or dis-coloring. Secures and stabilizes objects like picture frames tilting on a wall, holding up posters, objects of art sitting on pedestals, etc. I pinched off a small piece and rolled it on my kitchen counter top with my fingers and palm just like a clay "string" , until the diameter was about the size of Angel Hair spaghetti or a little smaller and about 6" long. I cut it into 6, one inch pieces. Turn the perch upside down and put a piece at the front, middle and back along the bottom edge of the plastic. Then I centered the perch on top on the platen (while it was off of the scale) and firmly pushed it down onto the platen, securing the bases to the platen. Now you have a small perch, attached to the platen by the two semicircle side frames holding the perch between them that will not move around. It is very stable and evenly spreads out the down force of the bird's weight on the scale. Being stable as it is, your bird will tend to remain centered and still while on the scale and your weighing will be very accurate to the tenth of a gram. My bird gets weighed every morning when he gets up and now after a few days of the routine, he looks forward to his "Weigh-Ins". You can make this same perch work on the i2500 with the round plate and by cutting the perch 2.5" wide and repeating the rest of the modifying steps. When you have two vertical supports holding the perch on top of the Platen instead of just one, the weight transfers to the plate in an equal and accurate manner. Your bird will generally stay between the two supports and there is "no tilting of the perch, resulting in weighing errors. I have already taken pictures of this "Modification" and left it w/my Vet. She has set up a display in her office and is going to make one for her to use at her home. Hopefully, the people at OWK Scales will read this and incorporate such in their site. It would be a win/win for everyone. They are too good at what they do, not to pass this on to others. Their perch was a good start for an idea but I think I just made a Better Mousetrap. Gabe says Old Will Knott Scales has made us Happy in Miami! Try it- you?ll love it.