What are some seven-letter birds?

25 of the 131 birds in Icillion have exactly 7 letters, for example Penguin, Sparrow and Ostrich.

Which seven-letter birds start with S?

S is the most common first letter here, with 5 names, such as Seagull, Skylark, Sparrow, Sunbird and Swallow.

Nature · lists

These are the seven-letter birds in Icillion: 25 names, from “Bittern” to “Wryneck”.

25 of the 131 birds have exactly 7 letters (19%).
Most start with S (5), B (4) and P (3).
Only names of one word are counted, and only their letters: spaces, hyphens and apostrophes are not.

What are some seven-letter birds?: 25 of the 131 birds in Icillion have exactly 7 letters, for example Penguin, Sparrow and Ostrich.
Which seven-letter birds start with S?: S is the most common first letter here, with 5 names, such as Seagull, Skylark, Sparrow, Sunbird and Swallow.

How deep does your knowledge go?

Seven prompts a day, twenty seconds each. Obvious answers float on the tip of the iceberg; rare ones sink all the way to the trench.