Tic beans and maples both have toxins in the outer skin , peas such as green , blue and white are better protein for your birds as don't have the negative toxin in the skins , from feeding my own mixes I don't use tic beans the reason for this is when I was younger it was always the tic beans the birds left . I preferred maples after reading the article i tried increasing the green pea however I found if the ratio of green pea was greater than 50% they would start to leave the green peas , so I use 3 parts maples to 2 parts green peas , what works for my birds may differ for others birds. I'll bump the article further nutritional consideration for pigeons