how old are your ducks? I would suggest you find a suitable cage or something like.. Place the cage where people walk past regular. Put the ducks in there, avoid touching them, but keep walking past the cage, (they will soon realise your not going to hurt them) once they stop looking afraid, and can stay sitting down relaxed when u walk past, you sit by the cage do silly baby voices etc so the recognise your voice is friendly, once they are looking more relaxed offer food by hand.. Then sit with them in a small area just offering them food by hand and talking to them, place food on your lap so they jump up, then gently put arms into cuddles with them, google how to pick up ducks correctly, .. its all about trust hope that helps