My daughter found a very young pigeon yesterday (no yellow feathers, but still being fed we think). Vet says it just needs to gain weight. We tried our usual rescue baby pigeon formula on it (budgie seeds, scrambled egg, some food yeast). We hand fed and it ate ravenously but this morning its croup was still quite full and it's not hungry. It is drinking (we hold a class up). The vet has no rescue formula. I've tried some almond milk and syringe on the base it was probably still getting pigeon milk. Any other suggestions?