Introduction:
The question asks which animals steal eggs, and the correct answer is option 'A', which states that crows and squirrels are the animals that steal eggs. This answer can be explained by looking at the behavior and habits of these animals.

Behavior of Crows:
Crows are known for their intelligence and resourcefulness. They have been observed to steal eggs from nests of other birds, including smaller songbirds. Crows are known to be opportunistic feeders and will take advantage of any easily accessible food source, including eggs.

Reasons for Egg Theft by Crows:
There are a few reasons why crows steal eggs:
1. Food Source: Eggs provide a high protein food source for crows, especially during breeding seasons when they need to provide nutrition for their own offspring.
2. Competition: Crows may steal eggs to eliminate competition for nesting sites and food resources. By removing the eggs of other bird species, they increase their chances of survival and reproductive success.
3. Nest Material: Crows are known to use eggs as nest material. They may steal eggs to line their own nests or to provide insulation for their eggs.

Behavior of Squirrels:
Squirrels are also known to steal eggs, although their behavior is less common compared to crows. Squirrels are opportunistic feeders and have been observed to raid bird nests and steal eggs.

Reasons for Egg Theft by Squirrels:
Similar to crows, squirrels steal eggs for food and competition reasons. Eggs provide a rich source of nutrients for squirrels, especially during times when food is scarce. By stealing eggs, squirrels can supplement their diet and increase their chances of survival.

Conclusion:
In conclusion, the correct answer to the question is option 'A', which states that crows and squirrels are the animals that steal eggs. These animals engage in egg theft for various reasons, including food source and competition. Understanding the behavior and habits of these animals can help in protecting nests and eggs from being stolen.

Crows and squirrels steel the eggs of birds.