A few years ago I had a small 2up/2down terrace in Spalding and the pond not much bigger than an upturned dustbinlid but in spring they arrived, tadpoles, newts frogs, and blackbirds singing in the trees, so I took a recording of their song. A few weeks later nestlings in the garden so I played their mother's recording, and one came skidding to a stop on my table on which the recorder was playing.