Reading passage : What is Woodpeckers?

What is Woodpeckers?

A woodpecker is a kind of bird. Woodpeckers are found all over the world except in the North and South poles, Australia, and New Zealand. There are over 200 different kinds of woodpeckers. The two largest woodpeckers, the Imperial Woodpecker and the Ivory-billed Woodpecker are most likely extinct. Animals that are extinct are no longer found on Earth.
Woodpeckers have sharp bills for drilling into wood, and short, stiff tails which help prop them up against tree trunks and branches. Woodpeckers also have very long tongues, which help them get at insects deep within trees. Woodpeckers are often heard drumming loudly on trees before they are seen. Woodpeckers can even become pests if they learn to drum on siding of a house.
Woodpeckers can easily be attracted to backyard bird feeders with sunflower seeds or suet. Suet is a kind of animal fat that is very tasty to woodpeckers and other birds.

Question :

1. Why do woodpeckers have long tongues?
2. When do woodpeckers sometimes become pests?
3. Woodpeckers are often .....
4. The two largest woodpeckers in the world are ......
5. Which is NOT true about woodpeckers? 

source : http://mrnussbaum.com