DDT contant in the water of a lake that supplies drinking water to the nearby villages, is found to be 0.003 ppm. The kingfishers of that area reported to have 2 ppm of DDT. Why has the concentration increased in these birds ? What harm will this cause to the bird population ? Name the phenomenon.

Explanation

### Step-by-Step Solution:

1. **Understanding the Initial Concentration**:
- The concentration of DDT in the lake water is given as 0.003 ppm (parts per million). This is a relatively low concentration of the chemical.

2. **Identifying the Concentration in Kingfishers**:
- The kingfishers, which are fish-eating birds, have been found to have a DDT concentration of 2 ppm in their bodies. This is significantly higher than the concentration found in the water.

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