Why is this the answer?

The answer is nest because this beautiful riddle gives us all the perfect clues about a bird's home and its precious eggs. Think about a bird building its home. Where does it build it? The first part says "A house of wood in a hidden place." A nest is a tiny house for a bird family. It is usually made of sticks, twigs, and leaves, which all come from wood. Birds always try to keep their nests safe, so they hide them high up in a tall tree or deep inside a thick bush. Finding one can be very tricky because it is a very good hidden place. It is a wonderful shelter from the rain and wind for the bird and its babies. Next, the riddle says the house is "Built without nails or glue." Can you imagine building a house without any tools? A bird does not go to the hardware store to buy supplies! They use their beaks and their tiny feet to weave and stick the natural materials together. Sometimes they use mud, wet leaves, or even strands of hair or animal fur to hold the nest tightly together, but they never use a hammer or sticky glue that a person would use. It is truly a wonder how strong they make their homes with just what they find in nature. Then the riddle tells us the nest is "High above the earthen ground." Most birds want to keep their babies safe from animals that might try to climb up from the ground, so they build their nests as high as they can. This helps protect the bird family from danger while the babies are growing. Finally, the most beautiful and colorful clue is that "It holds pale gems of blue." What is kept safely inside a nest? Bird eggs! A gem is a beautiful, precious stone. This clue is comparing the pale blue eggs to precious jewels. Not all bird eggs are blue, but the riddle uses this color to paint a perfect picture in your mind. These little eggs are precious to the bird family, just like a gem is precious to people. Because all of these clever clues describe a warm, hidden home built high in a tree to hold precious little eggs, the correct answer is nest.