Magpies have the reputation for eating lots of eggs and young birds. Although they do like eggs, this is only a small part of their diet. Nor is the number of songbirds declining due to them. Magpies like large insects the most, followed by berries and seeds. They build their nests high up in trees early in spring. The nest is an ingenious construction made from branches. The nests have a roof, making it much taller than a crow's nest.