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Recent palaeontological discoveries are shedding new light on the ancient oceans, particularly the role of giant octopuses that may have dominated marine environments approximately 100 million years ago, a period when dinosaurs still roamed the Earth. Traditionally, palaeontologists – scientists specialising in the study of fossils – held the belief that the largest ocean predators were exclusively vertebrates, animals possessing backbones, such as fish and marine reptiles. In contrast, invertebrates, which include creatures like octopuses and squid, were thought to have played only minor roles in the prehistoric food web.

However, this long-standing view is currently being challenged by groundbreaking new research originating from Hokkaido University in Japan. Their study focused on remarkably well-preserved fossilised jaws, identified as belonging to some of the earliest known octopuses. The detailed analysis of these ancient jaws indicates that these cephalopods were not merely effective predators but also reached astonishing sizes. Based on these findings, scientists estimate that their total length, including their powerful arms, could have spanned an impressive range from seven to a staggering nineteen metres, potentially positioning them as the largest invertebrates ever discovered.

According to the research, these colossal octopuses were equipped with robust arms, ideal for grappling with prey, and a formidable beak-like jaw. This jaw was apparently capable of crushing the hard shells and bones of large fish and even marine reptiles, suggesting a powerful bite. This predatory capability invites comparison to the modern Giant Pacific Octopus, which is known for its ability to tackle prey considerably larger than itself.

Another striking piece of evidence derived from the fossilised jaws is their uneven wear patterns. This asymmetry suggests that these ancient animals favoured one side when feeding. In contemporary living organisms, such a preference for one side is frequently associated with advanced brain function. Consequently, this observation strongly hints that these prehistoric octopuses, much like their modern descendants, possessed extraordinary intelligence and employed complex hunting strategies.

Despite these exciting revelations, many questions concerning these magnificent creatures remain unanswered. Scientists are still unable to precisely determine their exact body shape, the specific size of their fins, or their swimming speed. Furthermore, no fossil has yet been unearthed containing stomach contents, which would provide definitive evidence of their diet. Nevertheless, experts hypothesise that they were opportunistic and voracious predators, likely targeting ammonites but readily consuming any other available food sources.

1. What is the main purpose of the article?

• A.To describe the feeding habits of modern Giant Pacific Octopuses.
• B.To present new research that changes our understanding of ancient octopuses.
• C.To explain why vertebrates were the dominant predators 100 million years ago.
• D.To list the unanswered questions about ancient marine life.

2. Which detail about the ancient octopuses is NOT mentioned as a finding from the research?

• A.They had powerful arms for grabbing prey.
• B.They lived approximately 100 million years ago.
• C.They preferred to hunt at night.
• D.Their jaws showed uneven wear patterns.

3. What does the uneven wear on the fossilised jaws suggest about the ancient octopuses?

• A.They likely had advanced cognitive abilities.
• B.They primarily ate hard-shelled organisms.
• C.They struggled to find sufficient food.
• D.They were slower swimmers than previously thought.

4. What is the author’s attitude towards the new discoveries about ancient octopuses?

• A.Sceptical, questioning the reliability of the evidence.
• B.Indifferent, merely stating facts without enthusiasm.
• C.Critical, highlighting the limitations of the research.
• D.Enthusiastic, describing the findings as ‘groundbreaking’ and ‘exciting’.

5. In paragraph 4, what does the word ‘contemporary’ mean?

• A.Historical or from the past.
• B.Modern or existing at the present time.
• C.Similar in size or appearance.
• D.Unique or never seen before.