A group of eels has a few possible names. It can be called a swarm, cell, pipe, or an array. Which is odd since, true eels are a form of fish, but they are never considered a school.
The standard collective nouns are a bed of eels, a fry of eels, and a swarm of eels. Sorry, none that start with 'e'.However, a collective noun is an informal part of language. Any noun that suits the context of a situation can function as a collective noun; for example, an education of eels (school?), an emergence of eels, an eruption of eels, etc.
The types of eels are salt water eels, freshwater eels, the swamp eels, rubber eels and the electric eels. It is an elongated fish that lives in the shallow waters.
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.
Adult eels are called eels, babies are elvers
in eels
electric eels have an electric current that shocks thing Moray eels dont
eels eat fish
Eels have electricity.
Eels are classified as fish!
Eels are not naturally in Utah's bodies of water but there are eels in pet shops and aquariums.
EEls only eat flies if they are green eels, otherwise they ae very dangerous to eels and may kill the eel :(