The mourning dove appears in the New Testament, telling of Jesus's baptism, when the Holy Spirit descended as a dove, it ...

Baptism was not a new idea ... heaven was opened God’s spirit descended on Jesus God’s voice was heard A dove, often used as a symbol of peace, represents God’s spirit descending on Jesus.

Pupils could be asked if they can see how the trinity is connected to the baptism of Jesus (dove, voice, Jesus). Look at art works - such as the one in the clip - about this Bible story.