We compiled a list of 910 species beginning with the letter E.
You probably expect to find an Elephant in this list, but it is not here because we use species names rather than a group or common names. The term “elephant” refers to large, terrestrial proboscidean mammals, members of the family Elephantidae. There are only three living species currently recognized: the African bush elephant, the African forest elephant, and the Asian elephant. None of these species is included in this list as their full English name doesn’t start with the letter “E”.
Now let’s consider an example with Echidna. The term “echidna” refers to quill-covered egg-laying mammals belonging to the family Tachyglossidae. The four extant species of echidnas exist; these are the Short-beaked echidna, the Western long-beaked echidna, the Sir David's long-beaked echidna, and the Eastern long-beaked echidna. The later species' English name starts with the letter “E” so the Eastern long-beaked echidna is included in this list.
It can sound confusing sometimes so we made a list of popular animal names starting with the letter “E”. Here it is: Eel, Elk, Eagle, Elephant, Emu, Earthworm, Echidna, Eland, Earwig, Ermine, Emperor Goose, Eurasia Jay, Elf Owl, European Robin, Emperor Penguin.