Who is Water Striders from Joyful Noise: Poems for Two Voices and what is their importance?

Water Striders appear in the poem, Water Striders. Their ability to walk across water is frequently questioned throughout this poem, yet they consistently reply it is what they do most of the day. This skill is seen as a miracle by many, but these insects see nothing special about their abilities and are confused whenever they bring another species of insect down to the water to walk upon it, and the creature falls in the water every time.