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As per other sites the longest animal in world is ribbon worm also called lineus longissiums found in sctland

180 ft long

The longest animal in the world is not the python (officially 15m, 49 ft. long) but rather the adult blue whale (up to 33m, 108 ft).

The longest living thing is the root system of the winter rye plant (secale seriale) which can create up to 240 km (387 miles) of roots, from a single plant, in less than half a cubic meter.

The longest man-made object is the relatively contiguous "Great Wall of China", which stretches some 6400 km (4000 mi.) through China and Mongolia.

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Q: What are the world's longest things?
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