Step 1: Understanding the Concept: 
This question is based on a specific event from the story 'Gillu' by Mahadevi Verma. The story begins with the narrator discovering a baby squirrel in her garden. 
Step 2: Detailed Explanation: 
In the opening of the story, the narrator finds a tiny baby squirrel (who she later names Gillu) that had fallen from its nest. 
The baby squirrel was being attacked by a pair of crows, who were pecking at it. 
The crows saw the helpless baby squirrel as an easy meal or 'prey'. The narrator rescues the squirrel from these crows. 
Step 3: Final Answer: 
In the story 'Gillu', the squirrel was considered an easy prey by the crows.