Name the device used to measure the purity of milk.

Name this animal which is in danger.

Name the animal which is in danger.

This is the picture of a:

This is a:

Name the author of the famous novels, 'Oliver Twist' and 'David Copperfield'.

Which of the following have webbed feet?

Name this Indian bird which is under threat.

Name this animal which is illegally hunted for its horn.

Name the device to detect the direction and range of an approaching aeroplane.