Eclipse Tours  
   Solar eclipse tours to the next total solar eclipse, also includes tour packages for the Leonid Meteor Showers.
   http://www.eclipsetours.com

Geotours  
   Offers guided tours to geologists and others interested in collecting rock, minerals specimens and fossils in Argentina, Uruguay and Paraguay. Services, sample tours, costs.
   http://www.geotours.com.ar

Sahara Overland  
   Paleontological, geological, and off road field expeditions in Morocco. Order information on fossils available.
   http://www.saharaoverland.com/

Hole in the Sky Tours  
   Specializes in quality solar eclipse expeditions, combining vacations with optimized eclipse viewing. Eclipse information and resources. Contact information for California operation.
   http://www.holeinthesky.com

Diamantina Outback Tours  
   Offers expeditions based on natural history to remote regions of Outback Australia. Details of tours, booking, information on the Outback.
   http://www.diamantina-tour.com.au

Butterflies of Kerala  
   Travel agency highlights tours and excursions to see the butterflies and variety of species in Kerala, India. Photos and description of itinerary available.
   http://www.butterflieskerala.com

Watershed Belize Field Course  
   Describes watershed field course designed to experience travel through a tropical watershed in Belize; a journey from the Maya Mountains rainforest to the Barrier Reef.
   http://www.watershedbelize.org

Global Expeditions  
   Expeditions to foster exploration, conservation, community and medical aid in remote areas, led by John Blashford-Snell of Scientific Exploration Society.
   http://www.ses-explore.org

Phylum Tours  
   Phylum Tours leads individuals and groups to the remote and beautiful regions of Madagascar with customized tour packages focusing on natural history. Tours, testimonials.
   http://www.phylumtoursmadagascar.com

Burren Hill Walks - Ireland  
   Guided walks in the Burren region of Ireland on geology , botany and archaeology.
   http://homepage.eircom.net/~burrenhillwalks

Natural Selection Expeditions  
   Offers a selection of tours to the Galápagos Islands for both independent travellers and charter groups. Company profile, tour descriptions, news, travelling tips.
   http://www.nasexpo.com

Volcano Live  
   Provides information about volcanoes, eruption, and volcano treks, and links to other volcano educational sites. Includes links to volcano-cams.
   http://www.volcanolive.com

Kayenta Scientific Investigations  
   Information about geoscience tours in the Western United States.
   http://www.kayentasci.com/

Parawild Safaris  
   Works with professional game capture specialists in South Africa.  Visitors can have an hands-on, educational experience while being a part of wildlife conservation in action.  Also offers traditional wildlife viewing, cultural safaris, and adventure t
   http://www.parawild.co.za/

The Orchids of Cyprus  
   Information about planning a self-guided trip to Cyprus to see the native orchids, and recommends a new book on the subject.
   http://www.cyprus-orchids.freeservers.com/

Scientific Expeditions to Patagonia Organized by University of Connecticut  
   Groundbreaking ecological research at Torres del Paine National Park, Magallanes, Chile. Details about past and future expeditions.
   http://www.canr.uconn.edu/paine/

Raymond Wiggers, Guide and Educator  
   Professor conducts geology and botany tours. Site has links to free geology and botany information, details about past and upcoming expeditions, and photo galleries.
   http://raymondwiggers.homestead.com/

Reef and Rainforest Tours  
   ATOL-bonded tour operator features natural history itineraries, tailor-made and small group trips also available.
   http://www.reefandrainforest.co.uk/