Chirping and vulnerable-looking birds can look like they’re calling out for your help, but we humans can quickly do more harm than good in these situations. Young birds tend not to be as helpless or orphaned as they may seem, which is why German’s Nature And Biodiversity Conservation Union (NABU) advises you to stop and intervene only when it makes sense. Particularly noisy are fledglings that have opened their eyes and have feathers, but have not yet learned to fly. Their parents still feed them insects and use calls to communicate with them. So how can you tell if these little birds need hel…