All the angels pray. Every creature prays. Cattle and wild beasts pray and bend the knee. As they come from their barns and caves they look out to heaven and call out, lifting up their spirit in their own fashion. The birds too rise and lift themselves up to heaven: they open out their wings, instead of hands, in the form of a cross, and give voice to what seems to be a prayer. What more need be said on the duty of prayer? Even the Lord himself prayed. To him be honor and power for ever and ever. Amen.
–Tertullian (c.160 – 225)