We should therefore conclude that it is the latter who mimic the former.

If so, however, they must derive some advantage from the imitation, and as they are certainly weak birds, with small feet and claws, they may require it.

Now the Tropidorhynchi are very strong and active birds, having powerful grasping claws, and long, curved, sharp beaks.

They assemble together in groups and small flocks, and they haw a very loud bawling note which can be heard at a great distance, and serves to collect a number together in time of danger.
They are very plentiful and very pugnacious, frequently driving away crows and even hawks, which perch on a tree where a few of them are assembled.

It is very probable, therefore, that the smaller birds of prey have learnt to respect these birds and leave them alone, and it may thus be a great advantage for the weaker and less courageous Mimetas to be mistaken for them.