William W. Arnold (commonly "W. W."; August 28, 1843 – March 30, 1923) was a physician better known nationwide for his hobby as an ornithologist.

He wrote articles about nature and birds and gave talks about them to schoolchildren in Colorado and Indiana.

Within a year or two, a larger academy was built in Fairview to manage the influx of school children.

In appreciation, Arnold was given a long-stemmed pipe and bear claw necklace and was adopted by the Chippewas of the Crow Wing Reservation in Minnesota.

Arnold was a member of national, state, and El Paso County Medical Associations.

[10][12] He treated wounded birds, set broken bones, and administered medicine; when they were healed, he released them.

[12] He wrote the story "Stubby, The Bird Evangelist" about the life of a black-headed grosbeak that was published in the Colorado Springs Gazette in 1914.

He explained that over time he developed a routine for feeding with slim forceps and varying the birds' diet of berries, fruits, worms, and hamburger meat as they healed.

[13] He created a bird section, was an associate editor for Colorado Sky and wrote articles for other publications.

[14] After her husband's death, Eva continued to operate the bird hospital with Augustus P. Brigham, who also established the Arnold Nature Club for children.