LifeBiggest ever flying bird and the beast that dwarfed itPelagornis sandersi was twice the width of a wandering albatross – the largest living bird – but was nevertheless dwarfed by the biggest pterosaurs Regulars
LifeThe father enigma: Why do nature's devoted dads care? From male pipefish pregnancies to single-father frogs, evolution has produced some truly doting dads – and made the job surprisingly rewarding Features