Edible Nest

It's amazing to know that bird nests can be edible.The nest built by a small bird (Aerodramus fuciphagus) of  the swift family  found in South-east Asia  is made of solidified saliva and is edible.It breeds in colonies in caves, in a cleft or in a cliff or sometimes  on a building.These Swiflets often nest in pitch dark caves.They are able to do this by using echolocation, similar to bats.The bracket-shaped nest is white and translucent and is made entirely  of layers of hardened saliva attached to the rock. It measures about 6 cm across with a depth of 1.5 cm and a weight of about 14 grams.

Floating Nest

Building nest out in the water seems to be impracticable but it is a fact.Several birds build nests which are surrounded by water and even floating in water. Birds like Coots build build such type of nests having a foundation of vegetation, which reaches the ground below.Water birds like Grebes build nests which are basically floating on shallow water though they are often anchored at one or two points.However totally floating nest are bulid by Jacanas and Marsh Terns.The floating nests often sinks into the water while the bird
is sitting for incubation, but due to water proof eggs the chicks easily come out without any harm.

Hole Nest in Trees

Holes in dead or alive trees are a good option for  nesting by birds .Fewer birds like the woodpeckers and Barbets excavate their own holes in trees for nest building.Most tree hole nesters make use of the already existing holes in large or small trees.Most common hole nesters are Parrots, common Starlings, Hornbills, Owls, Indian rollers and some flycatchers.The nest in tree holes has the define advantage of protection from predators and weathers.Birds do modify the tree holes like lining with soft materials or mud plastering  in case of Horn bills. However the disadvantage is that due to warm and humid conditions inside the holes there is more chances of avian pests and nest parasites build up.It is a wonder that The Great Indian Hornbill nearly a meter long in size  likes to nest at 20-45 meters up the tree .This means it can only  nest in trees which have a diameter greater than 1-2 meters at that height. As the large trees are fast decreasing in the forests, the existence of the Great Hornbill is now a concern.

Hole Nest in Ground

Very few birds nest within holes in the ground.Nesting in hole  seems to be a better strategy than nesting in the open.We survey around 100,000 eggs and found that non-hole nesters averaged 48% rearing success while hole nesters averaged 74%.The main reasons seems to be eggs within holes in the ground are better protected against adverse environmental conditions and from predators.The hole nests can be  open onto a cliff edge or a vertical edge of a river bank,Road cuttings and those holes in relatively flat ground.Some birds dig the holes themselves and some uses the already existing holes.Birds making this types of nest are green bee eater and all king fishers.Green bee eaters make almost 1 meter hole in flat ground as well as edges to lay their eggs.

Black Naped Monarch Flycatcher Feeding

This is the video of a Black naped Monarch Flycatcher feeding it's chick.This Nest is located on a mango tree near Hirakud Reservoir.

Cup nest with roof

The cup shaped nest with roof are more advanced than the usual cup nest.They are generally rounded or elliptical in shape and appears like a ball with a side entrance.This type of nest offer more protection to the eggs and chicks than a simple cup nest.These nests are built with grasses, leaves, fibers, small sticks etc.The inner is covered with soft materials to provide more comfort. Birds like Red munia, scally breasted munia, rufous bellied babbler, white munia, rufous winged bushlark etc build this types of nest. The photo above shows the nest of rufous bellied babbler.The nest is found in the vicinity of river Mahanadi in Sambalpur, Orissa, India.

Cup Nest

Fig: Cup nest built by Asian Paradise Flycatcher

The cup shape nest is the 3rd inorder of simple to complex nest In my previous posts I have given information about first two type of nests.The cup shaped nest is more advanced than simple twig nest.This is the most typical form of nest and found in abundant as most flycatchers build this type of nest.The cup shape nest have a clear inside as well as an outside and the inside is lined with softer materials for more comfort.This type of nest also provide more protection for both the eggs and chicks.They are generally build at the forked branch of a tree i.e either "V" or "Y" shaped branch.These nests are build with leaves, grasses, finer twigs sticked together with cobwebs. Birds like Asian Paradise Flycatcher, Monarch Flycatcher, Faintail Flycatcher, Humming birds, Bulbul,Oriole, Drongo etc build cup shaped nest.