Read the following passage and answer the questions given below.

They are covered with a thick coating of spikes but these are white and soft, as though made of rubber. They gradually harden and turn brown when the babies are a few weeks old. When they are old enough to leave the nursery the mother leads them out and shows them how to hunt for food; they walk in line, the tail of one held in the mouth of the baby behind. The baby at the head of the column holds tight to mother’s tail with grim determination, and they move through the twilit hedgerows like a strange prickly centipede … 

Mine were always ready for food at any hour of the day or night. You had only to touch the box and a chorus of shrill screams arose from four little pointed faces poking out of the leaves, each head decorated with a crew-cut of white spikes; and the little black noses would wave desperately from side to side in an effort to locate the bottle.

Most baby animals know when they have had enough, but in my experience this does not apply to baby hedgehogs. Like four survivors from a raft, they flung themselves on to the bottle and sucked and sucked and sucked as though they had not had a decent meal in weeks. If I had allowed it they would have drunk twice as much as was good for them. As it was, I think I tended to overfeed them, for their tiny legs could not support the weight of their fat bodies, and they would advance across the carpet with a curious swimming motion, their tummies dragging on the ground. However, they progressed very well: their legs grew stronger, their eyes opened, and they would even make daring excursions as much as 15 centimetres away from their box.