I tried a critter collector, but could not get the website to work to download the different sounds. Of all the sounds there, only a few were worth using. Some of them sounded like a person trying to mimic an animal, with their mouth. I did get it to work for just a bit, using Google Chrome, but it quit, and could not do anything with it again. Tried 3 different computers and 3 different browsers. I think they have a good idea, but if you can't make it work, all those sounds are not much good. I have ordered a couple of Wasatch callers. Have you ever tried the Lucky Duck Digital Squeakers? I can't find any kind of squeaker on MTP's site.