Owls in the garden

Mary saw them first, because she had seen the robin suddenly fly away and stood up to look where he had gone, and so she saw what had flighted him. Two great owls were gliding silently in to perch, in a flapping of great wings, one pair tawny, one snowy white, atop the garden's wall. She looked round for Colin and Dickon, already sure that these owls must be friends of Dickon's, like every other animal who came to the garden behaving more tamely than they could be expected to.