A study was done to find out more about them. Findings were based on detor-reaching, where food was hidden in transparent containers. Food was also put in the same place and birds were observed. Unfortunately, little detail of how this proved the connection with non-social group performance.
Bold claims by this study are yet to be justified. Just seeing magpies behave in our gardens shows they know what they are doing. Scientists are not the only ones observing the maggies. People cannot but admire our smart feathery friends.
More work is needed to identify what is really going on. Cracticus are doing very well living alongside humans, even breeding in cities and vigorously defending their nests. Avians must do what comes naturally. They are clever: we all know that.