Nesting Behaviour of Birds: Simple nest

This post of mine is continuation of nesting behaviour of birds.Simple nests or twig nests are built using plant material mainly twigs and sticks.The twigs are gathered on tree branches to build a simple platform just to support the eggs. Some nests have a depression on the middle but generally they don't have any inner or outer side.The eggs can be seen through the nest from below.common example of simple nests are those build by pigeons,doves, herons,Gulls and Eagles.