The goldfinch entered the thickness of the laburnum tree because it had to reach its nest where its young ones were waiting to be fed by her. The lines that support the answer are 'a machine starts up', 'of chitterlings and a tremor of wings and trilling'.

The lemburnum play an important role for the goldfin. the tree play shelter for the gold field

The tree plays a crucial role for the Goldfinch bird as a shelter.

The Goldfinch bird, like many other birds, relies on trees for various aspects of its survival. Trees provide a safe and secure habitat for the Goldfinch to build its nest and raise its young. Here are some key points explaining the role of trees as shelters for Goldfinch birds:

1. Nesting Site:
- Goldfinches are known for building their nests high up in trees.
- They prefer trees with dense foliage, providing them with protection from predators and harsh weather conditions.
- The tree's branches and leaves act as a natural camouflage, making it difficult for predators to locate the nest.

2. Protection from Predators:
- Trees offer a strategic advantage to Goldfinches by providing a vantage point to spot potential predators.
- The height and intricate branching structure of trees make it challenging for predators to approach the nest unnoticed.
- Additionally, the Goldfinch's bright yellow plumage blends in with the green foliage, providing some level of camouflage.

3. Shelter from the Elements:
- Trees provide protection from extreme weather conditions.
- The dense foliage acts as a shield, reducing the impact of wind, rain, and direct sunlight on the nest.
- The tree's canopy also provides shade, helping to regulate the temperature within the nest, ensuring the eggs and nestlings are not exposed to excessive heat or cold.

4. Roosting and Resting:
- Goldfinches often use trees as roosting sites during the night.
- The branches of the tree offer a secure place to perch and rest, away from predators on the ground.
- Roosting in trees also allows Goldfinches to conserve energy by minimizing heat loss during cold nights.

In conclusion, trees play a vital role as shelters for Goldfinch birds. They provide a suitable nesting site, protection from predators, shelter from the elements, and a safe place to roost and rest. Without trees, the Goldfinch's survival and reproductive success would be significantly compromised.