Now in spring a lot of birds get offspring and it is nice to watch the different birds with their babies. Near the babies there were always the watchfull eyes of the parents that are very protective about their offspring, getting too close to them can result in an attack from the adults. But when the adults are confident and see that you are not a threat then you might get pretty close to the birds without them being nervous. You always need to build some kind of trust relationship and try to move slow around them.