The figure below shows the amount of time it takes pigeons in groups of varying size to respond to a potential predator. Based on this graph, pigeons experience what benefit from grouping? 
Definitions:
Interference
A cognitive process where previously learned information hinders the ability to learn new information or the retrieval of information due to the non-helpful interaction between different pieces of information.
Proactive Interference
The phenomenon where older memories interfere with the recall of newer memories, often causing confusion or mix-ups.
Retroactive Interference
The phenomenon where new memories impair the retrieval of older memories.
Hindsight Bias
The tendency to believe, after learning an outcome, that one would have foreseen it, often referred to as the "I-knew-it-all-along" effect.
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