they can be 4ft to 6ft long
very long
2cm long
1mm
22 yeas
cool
Giant moray eels can be as much as 4 metres in length
Sand eels are about 5" long.
villiamu stinks
under houses
15 years
they have the same long body
We do not know as eels do not leave good fossils. Also your English is a bit wrong your question should be worded "How many extinct eels were there". This is because if they are extinct they would have lived in the past not the present.