Many species of neornithines can build burrows, or nest in tree holes or termite nests, all of which provided shelter from the environmental effects at the K – T boundary.

They mostly cache their foods in a larder in their burrows and remain in their nests until spring, unlike some other species, which make multiple small caches of food.

Habits intermediate between those of the herbivorous and parasitoid forms are shown in some hymenopterans, which inhabit the galls or nests of other insects, stealing their food, and eventually killing and eating the occupant.

A great walker, he loved roaming in the woods, often returning with natural curiosities, including birds ' eggs and nests, of which he made crude drawings.

In one, typified by the Northern Jacana and some other ground-living birds, the female takes on much the same role as the male in a polygynous species, holding a large territory within which several males build nests.

She moves the young frequently among several nests, all of which she keeps clean.

They struggle against dug-in German infantry, machine gun nests, and artillery fire, which cut down many of the men.

Another reason for dropping numbers are the introduction of non-native species, such as the " parasitic " cowbird, which steals the nests of other birds to use as its own.

An example is the brood parasitism practiced by many species of cuckoo and cowbird, which do not build nests of their own but rather deposit their eggs in nests of other species and abandon them there.

The plan included more emphasis on the use of heavy and medium artillery to destroy German concrete pill-boxes and machine gun nests which were more numerous in the battle zones being attacked and to engage in more counter-battery fire.

ants, which make their nests in modified leaves.

In the ringing studies birds ringed as chicks are recapatured close to their original nests, a tendency which can be extreme at times ; in Laysan Albatross the average distance between hatching site and the site where a bird established its own territory was, and a study of Cory's Shearwaters nesting near Corsica found that of nine out of 61 male chicks that returned to breed at their natal colony actually bred in the burrow they were raised in.

This type of nest founding is not seen in any other living bee genus, though there are several groups of Vespid wasps which also found new nests via swarming ( sometimes including multiple queens ).

They destroy nests and eggs but their worst effect is as competitors for food, which could be catastrophic for the cassowaries during lean times.

Both types of nesting site are vulnerable, those on level ground are vulnerable to trampling and small predators, whereas those in cliffs, which are often the banks of rivers, are vulnerable to flash floods, which can wipe out dozens or hundreds of nests.

Doves and pigeons build relatively flimsy nests from sticks and other debris, which may be placed in trees, on ledges or on the ground, depending on species.

In the mountains of Eurasia, pikas often share their burrows with snowfinches, which build their nests there.

There is a second species of bumblebee occurring there, Bombus hyperboreus, which is a parasite in the nests of B. polaris.

This is a pelagic seabird which had dug burrows for its nests.

Some species have benefited from this fact, for example the Brown-headed Cowbird, which is a brood parasite that lays its eggs in the nests of songbirds nesting in forest near the forest boundary.

Woodpeckers also use their beaks to create larger holes for their nests which are 15 – 45 cm ( 6 – 18 inches ) below the opening.

It is a gregarious bird which often nests in groups with each pair defending a small territory.

Spiders use their silk to make webs or other structures, which function as nets to catch other animals, or as nests or cocoons for protection for their offspring.

A single site might cover many thousands of acres, and the birds were so congested in these areas that hundreds of nests could be counted in a single tree.

The word " trogon " is Greek for " nibbling " and refers to the fact that these birds gnaw holes in trees to make their nests.

As they live in colonies, large numbers of these holes are often seen together, white streaks from their accumulated droppings accentuating the entrances to the nests.

The cays form an Important Bird Area because they support more than 1 % of the world populations of Black Noddies ( with up to 300, 000 nests ) and Wedge-tailed Shearwaters ( up to 560, 000 nests ), making up the majority of the east Australian breeding populations of these species, and sometimes more than 1 % of the world population of Brown Boobies ( 1000-4000 nests ).

Some of these species still return to the ocean to feed ; for example, the Snow Petrel, the nests of which have been found inland on the Antarctic mainland, are unlikely to find anything to eat around their breeding sites.

Some of these are probably road-kills or are pirated from eagles or other raptors but they are also believed to occasionally attack live animals, especially young and weak animals and the nests and young of other birds.

When the leaves fall these huge nests are plainly visible.

The size of these colonies may be large, ranging between 5 – 500 nests per colony, with an average of approximately 160 nests per colony.

Most of these species nest in trees or bushes, but the coucals lay their eggs in nests on the ground or in low shrubs.

The nesting habits of these birds are similarly variable, including pendulous woven nests in the oropendolas and orioles.

They also appropriate nests of other mid-sized songbirds as long as these are placed in suitable spots ; American robin nests are commonly used by Blue Jays, for example.

Blue Jays will use these calls to band together to mob potential predators such as hawks and drive them away from the jays ' nests.

In wooded areas and grasslands these ranged from hollow logs and nests made out of grass, while in arid treeless country this animal used to dig short, straight burrows with a nest at the end.

Although these beetles often remain in deserted nests, they can only breed in the elevated temperatures produced by brooding birds, tits being the preferred hosts.

Examples of these behaviours include laying eggs in the nests of related individuals and crèching, where female eiders team up and share the work of rearing ducklings.

Australo-Papuan babblers construct large nests for communal roosting, and these nests may be used for breeding, or new nests may be constructed.

Spawning and caring for the eggs and larvae takes place in these nests.

The floor of the valley is carpeted with diamonds, and merchants harvest these by throwing huge chunks of meat into the valley which the birds then carry back to their nests, where the men drive them away and collect the diamonds stuck to the meat.

A common species of cuckoo wasp, Chrysis angolensis, is frequently a cleptoparasite in Sceliphron nests, and is only one of many different insects that parasitize these mud daubers.