Bill Clark

Osprey photo by Stephen L. Tabone

Bill Clark

Bill Clark at Khao Dinsor
Bill at Khao Dinsor, Thailand

My university degrees are a B.S. in Math, a M.S. in Nuclear Engineering, but no Biology degree.

I started with banding and learning about raptors in the 1960’s, and since then I’ve observed raptors in 56 countries. I led my first raptor tour in the U.S. in 1983, and led or co-led raptor tours in 12 countries including Argentina, Australia, Hungary, India, Israel, Kenya, Madagascar, Mexico, Panama, South Africa, Thailand, and the U.S., where I also teach Raptor ID Weekends.

My favorite raptor species is the one I am studying or looking at. In fact, I like all raptors.

I have seen more than 300 species of diurnal raptors, depending on taxonomic splits or lumps. Another way to look at this is that I have yet to see about 30 species.

As the Chairman of RAPTOURS’ Board of Advisors I am able to help set up unique bird tours that focus on raptors. I also am on the Board of Belize Raptor Research Institute. I am a member of Raptor Research Foundation, Asian Raptor Research and Conservation Network, and the Neotropical Raptor Network.

I have authored or co-authored two raptor field guides for North America, one for Europe, and I am working on two more which are almost finished (Africa, and Mexico and Central America). I’ve also co-authored two eagle bibliographies. In addition, I have published more than 140 journal articles and papers in conference proceedings.

I teach Raptor ID Weekends in the U.S. ocassionally, and for Raptours I lead or co-lead occasional raptor tours abroad to destinations as varied as Australia, Kenya, South Africa or Thailand.

Raptor Talks

I also give Raptor Talks within the US. Email me at to schedule a Raptor Talk for your group or organization. Please find below the list of Raptor Talks currently available.

  • Eagle Quest
  • Eagles of the World
  • Raptors of the Rio Grande Valley
  • Turkey Vultures
  • What is Harlan’s Hawks?
  • World Raptor Migration
  • Bald Eagle Ageing
  • Field Guide to the Raptors of Mexico and Central America
  • Field Guide to the Raptors of Africa
  • Unusual Plumages of Raptors

Send Bill a message.