The Swarm by Rob Heinz

Not your average read this but good nonetheless!!! Set on an island just off the American coast (only separated from the mainland by bridges) the place is thrown into turmoil one day when most of the community stop what they are doing and walk like zombies to a beach where they start to mate, only to wake after it has all done. It becomes clear that only the people who can reporoduce have become invovled and one of those that is n't films the whole thing on his iPhone and posts it to the net. The government quarantines the island and starts to hunt down the women who won't voluntarily temrinate their pregnancies. Prior to this a worker at the refuse department has discovered a small clearing where the land seems to eat scrap metal...... and after a while, even dead bodies. Nearly all of the swarm pregnancies do get terminated ...... all except one and it is the lead up that birth and the steps taken to keep it hidden that help build the story. All hell breaks loose at the birth!!! Great book :-)