Until recently, many biologists believed that invertebrate "schools" were actually transient assemblages, brought together by wind, currents, waves, or common food sources.
Topic
Schooling behavior in invertebrates and its advantages and drawbacks
Framework
Old / New
Main Point
Recent research has shown that many invertebrates, contrary to earlier belief, do form structured schools like fish do, and schooling brings a variety of benefits and some costs. (The Most Valuable Sentence appears at the end of the first paragraph: )
P1: Shifting Beliefs About Invertebrate Schooling
Until recently, scientists thought invertebrate groupings were just temporary and caused by environmental factors, but new research shows many actually form true schools, much like fish do.
P2: How Invertebrate Schools Work
Invertebrates that school do so in an organized way, maintaining consistent positioning; their grouping is pretty stable unless disturbed by predators.
P3: Passive Benefits of Schooling
Schooling, despite being risky and making the animals more visible, actually helps members avoid predators by making them harder to track individually, increasing group vigilance, and improving individual survival odds.