Study the following: Crows make their nests high up on a tree using all kinds of things, even pieces of wood and wires. A clever bird who does not make its own nest lays eggs in a crow's nest. The poor crow hatches them along with its own eggs. Which bird is this?

Study the following: Crows make their nests high up on a tree using all kinds of things, even pieces of wood and wires. A clever bird who does not make its own nest lays eggs in a crow's nest. The poor crow hatches them along with its own eggs. Which bird is this? Correct Answer Koel

Concept:

  • Birds build nests to lay their eggs and incubate their younger ones.
  • Not all birds build nests eg. Koel lays its egg in the nest of a crow.
  • Different birds build nests at different places, some on ground level, some high up on the tree.
  • Different birds use different techniques and different materials to build their nests.

Explanation:

  • The crow builds its nest high up on a tree with all kinds of materials
  • The koel lay their eggs in crow nests.
  • This ensures that there's a higher chance of clutch formation. (The clutch is the number of eggs laid).
  • The koel's eggs resemble those of the crow in pattern and colour, which helps them in nesting.

Additional Information

  • The dove makes its nest among the thorns of a cactus plant or a Mehendi hedge
  • The sparrow and pigeon make their nest anywhere on top of a cupboard, behind a mirror, on a ledge.
  • The barbet or coppersmith bird makes its nest in a hole, in a tree trunk.
  • The tailorbird uses its sharp beak to make its nest by stitching together two leaves on a bush. It lays its eggs in the fold of the leaf that it has made.
  • The sunbird makes a nest that hangs from the branch of a small tree or a bush.
  • The robin makes its nest with  soft twigs, roots, wool, hair and cottonwool at ground level, lower branches of a tree or sometimes at the top

Related Questions

Historically, the production of wood charcoal in locations where there is an abundance of wood dates back to a very ancient period, and generally consists of piling billets of wood on their ends so as to form a conical pile, openings being left at the bottom to admit air, with a central shaft to serve as a flue. The whole pile is covered with turf or moistened clay. The firing is begun at the bottom of the flue, and gradually spreads outwards and upwards. The success of the operation depends upon the rate of the combustion. Under average conditions, 100 parts of wood yield about 60 parts by volume, or 25 parts by weight, of charcoal; small-scale production on the spot often yields only about 50%, while large-scale became efficient to about 90% even by the seventeenth century. The modern process of carbonizing wood, either in small pieces or as sawdust in cast iron retorts, is extensively practiced where wood is scarce, and also for the recovery of valuable byproducts (wood spirit, pyroligneous acid, wood tar), which the process permits. The information given, if accurate, most strongly supports which of the following?