Are two parents better than one? Yes, but only if you`re a burying beetle
(PHYSorg.com Biology)

Parenting behaviour varies greatly across the animal kingdom. In most mammals, only mothers look after the young, and in most fishes, only fathers look after the young. When it comes to birds, mothers and fathers usually work together to build a nest, feed their chicks, keep them warm, and protect them from predators. At the opposite end of the spectrum are insects, where in most cases, the young are left to fend for themselves.