“Greenery: Journeys in Springtime” is a hugely vigorous and lyrical exploration of bird migration and the season of Spring. Tim Dee, radio producer and broadcaster, and acclaimed nature writer, follows the season with the migration of swallows, from South Africa to the Arctic Circle, from December to June. I loved his besotted description of birds on his journeys; he describes a Wallcreeper, a bird I’ve tried to see but never with success, as “the most marvelous fluttering mouse.” If his naturalistic reveries sometimes left me nonplussed, I take that as a black mark against my character, and I heartily recommend “Greenery” to readers yearning to experience the wider world from a different perspective.