Halfway house

Two fossilised jawbones unveiled this week in London could provide the
missing evolutionary link between fish and land animals. Excavated from rocks in
Latvia and Estonia, the 370-million-year-old fossils are from “a transitional
half-fish, half-amphibian”, says Per Ahlberg of the Natural History Museum in
London. “The most important thing is what happens when the paired fins turn into
arms and legs,” he says, but only a whole skeleton can provide the answer.