Across
- This was a gigantic 4m long turtle that lived near the end of the dinosaur era. (8)
- This is the largest known ichthyosaur known. It was a massive 15m long with a deep vast body. It lived about 210 million years ago (11)
- This found it easy to float in the sea because of its air-filled found it easy to float in the sea because of its air-filled lungs, however it was not so easy for them to dive under water. (13)
- This fits the description of both ancient sea monsters and creatures like the famous modern-day "Loch Ness monster" (12)
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Down
- This, with its flippers, fins and smooth, streamlined body was incredibly dolphin-like and this species was probably the acrobat of the seas (13)
- This was a small short-necked pliosaur. It was only 3m long. Like other pliosaurs it probably hunted by hiding in wait for its prey and then diving quickly after it (11)
- This was another fearsome pliosaur - with powerful paddles this enormous marine reptile flew through the sea. (10)
- This was a huge pliosaur - 17m in length! Fossil evidence for this creature's existence has only been found in Australia (11)
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