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A true opposed pollex mostly appears in mammals like primates.

Another reason we know the thumbs-up was the kill signal was a gesture known as the infestus pollex or hostile thumb, which is mentioned in texts but, again, isn't pictured.

All have dark brown nuptial tuberosities on the pollex.

A pollex is wanting, as in the cassowary, emeu and apteryx, while it is impossible to say whether remiges are represented or not.

The pollex and the third finger are as a rule reduced to one phalanx each, while the index still has two.