Glowworms were tiny animals which glimmered in dark environments.
Other versions of the legendarium
In The Book of Lost Tales, Beleg is said to have thought of glowworms when seeing the bright light of Noldo crystal lanterns. Glowworms are also said to have been creeping about the borders of the deep pools of Murmuran.
- J.R.R. Tolkien, The Lord of the Rings, The Two Towers, "The Stairs of Cirith Ungol"
- J.R.R. Tolkien, Christopher Tolkien (ed.), The Book of Lost Tales Part Two, "II. Turambar and the Foalókë", p. 78
- J.R.R. Tolkien, Christopher Tolkien (ed.), The Book of Lost Tales Part One, "III. The Coming of the Valar and the Building of Valinor", p. 74