GENERAL KNOWLEDGE: What is "worth a thousand words"?

Questions

---------- crumble leaves in their mouths to make a type of sponge to sop up water from the hollows in trees when they can't reach the water with their lips.?

The ----------, national bird of New Zealand, can't fly. It lives in a hole in the ground, is almost blind, and lays only one egg each year. Despite this, it has survived for more than 70 million years.?

The blue whale weighs as much as thirty elephants, and is as long as three ----------?

One way birds learn is by trial and error. Scientists have discovered that many of their learned motor patterns are linked to appetite. For instance, young doves must learn to drink water. The pecking of domestic chicks improves about 30 hours after hatching. They snatch up a grain with increased efficiency. Simple trial-and-error learning is also believed to be very important in birds' ----------?

---------- have been trained to have recognition vocabularies of 100 to 200 words. They can distinguish among different grammatical patterns.?