Fishhook barrel cactus, Saguaro National Park (Rincon Mountain District), Arizona Public domain scan of drawing, botanical illustration, free to use, no copyright restrictions image - Picryl description
Cactus up close Public domain photograph of cactus plant, free to use, no copyright restrictions image - Picryl description
Saguaro cactus Public domain photograph of cactus plant, free to use, no copyright restrictions image - Picryl description
Participant learning about sound monitoring and natural sounds. Public domain photograph related to US National Parks, Nature, conservation, free to use, no copyright restrictions image - Picryl description
Pincushion cactus, Saguaro National Park (Tucson Mountain District), Arizona Public domain photograph of cactus plant, free to use, no copyright restrictions image - Picryl description
Ironwood, Saguaro National Park (Tucson Mountain District), Arizona
Rattlesnake Public domain photograph by National Parks Administration, nature conservation, tourism, free to use, no copyright restrictions image - Picryl description
Biological soil crust Public domain photograph by National Parks Administration, nature conservation, tourism, free to use, no copyright restrictions image - Picryl description
Taylor Edwards, a scientist from the University of Arizona.
Youth participants learning about sound monitoring and natural sounds.
Jojoba, Saguaro National Park (Tucson Mountain District), Arizona Public domain scan of drawing, botanical illustration, free to use, no copyright restrictions image - Picryl description
BioBlitz youth participant Public domain photograph by National Parks Administration, nature conservation, tourism, free to use, no copyright restrictions image - Picryl description
Filming the electronic field trip. Public domain photograph by National Parks Administration, nature conservation, tourism, free to use, no copyright restrictions image - Picryl description
Onstage at the BioBlitz. Public domain photograph by National Parks Administration, nature conservation, tourism, free to use, no copyright restrictions image - Picryl description
Youth participant learning about sound monitoring and natural sounds.
Saguaro National Park ranger and student taping an electronic field trip.
Collema coccophorum Public domain photograph by National Parks Administration, nature conservation, tourism, free to use, no copyright restrictions image - Picryl description
Park ranger and BioBlitz youth ambassador Public domain photograph of educational activity, National Park rangers, free to use, no copyright restrictions image - Picryl description
Desert plants Public domain photograph of cactus plant, free to use, no copyright restrictions image - Picryl description
Saguaro cactus, Saguaro National Park (Rincon Mountain District), Arizona Public domain photograph of cactus plant, free to use, no copyright restrictions image - Picryl description
Red Hills Visitor Center sign Picryl description: Public domain photograph of National Park, nature, free to use, no copyright restrictions image.
Saguaro cactus with paloverde and cholla Public domain photograph of cactus plant, free to use, no copyright restrictions image - Picryl description
Saguaro cactus, Saguaro National Park (Rincon Mountain District), Arizona Public domain photograph of nurses, hospital, medical care, free to use, no copyright restrictions image - Picryl description
Youth participant learning about sound monitoring.
The spines of juvenile saguaro cacti are denser than those of mature plants. Saguaro National Park (Rincon Mountain District), Arizona.
Student Conservation Association intern sorting aquatic life.
Billy B performing with students Public domain photograph by National Parks Administration, nature conservation, tourism, free to use, no copyright restrictions image - Picryl description
placidium Public domain photograph by National Parks Administration, nature conservation, tourism, free to use, no copyright restrictions image - Picryl description
BioBlitz youth ambassador Valyssa. Public domain photograph related to US National Parks, Nature, conservation, free to use, no copyright restrictions image - Picryl description
Zebra-tailed lizard Public domain photograph related to US National Parks, Nature, conservation, free to use, no copyright restrictions image - Picryl description
BioBlitz participant and youth ambassador Dara examining a pool of water for signs of life.
Filming the electronic field trip. Public domain photograph related to US National Parks, Nature, conservation, free to use, no copyright restrictions image - Picryl description
Pencil cholla, Saguaro National Park (Rincon Mountain District), Arizona
Grasshopper Public domain photograph related to US National Parks, Nature, conservation, free to use, no copyright restrictions image - Picryl description
BioBlitz youth ambassador Dara. Public domain photograph by National Parks Administration, nature conservation, tourism, free to use, no copyright restrictions image - Picryl description
Ecologist Evan Gwilliam performing an aquatic survey.
Purple flowers Public domain photograph of a wildflower close up, nature, flowers, free to use, no copyright restrictions image - Picryl description
Desert flower Public domain photograph of a wildflower close up, nature, flowers, free to use, no copyright restrictions image - Picryl description
Opuntia skeleton, Saguaro National Park (Rincon Mountain District), Arizona Public domain photograph of coral reef, underwater life, free to use, no copyright restrictions image - Picryl description
Christmas cholla, Saguaro National Park (Rincon Mountain District).
BioBlitz participants draws in a notebook
SCA intern performing water quality calculations.
Opuntia Public domain photograph of cactus plant, free to use, no copyright restrictions image - Picryl description
Fairyduster, Saguaro National Park (Rincon Mountain District), Arizona Public domain photograph of a wildflower close up, nature, flowers, free to use, no copyright restrictions image - Picryl description
Park ranger on stage Public domain photograph of educational activity, National Park rangers, free to use, no copyright restrictions image - Picryl description
Collema tenax Public domain photograph by National Parks Administration, nature conservation, tourism, free to use, no copyright restrictions image - Picryl description
Peltula richardsii Public domain photograph by National Parks Administration, nature conservation, tourism, free to use, no copyright restrictions image - Picryl description
BioBlitz youth participant Public domain photograph related to US National Parks, Nature, conservation, free to use, no copyright restrictions image - Picryl description
Rattlesnake Public domain photograph of an animal, free to use, no copyright restrictions image - Picryl description
Saguaro cactus forest Public domain photograph of cactus plant, free to use, no copyright restrictions image - Picryl description
Upclose cactus Public domain photograph of cactus plant, free to use, no copyright restrictions image - Picryl description
Cactus Public domain photograph of cactus plant, free to use, no copyright restrictions image - Picryl description
Ecologist Evan Gwilliam performing an aquatic survey. Public domain photograph related to US National Parks, Nature, conservation, free to use, no copyright restrictions image - Picryl description
Youth ambassador Dara. Public domain photograph by National Parks Administration, nature conservation, tourism, free to use, no copyright restrictions image - Picryl description
Students with their biodiversity flags. Public domain photograph by National Parks Administration, nature conservation, tourism, free to use, no copyright restrictions image - Picryl description
Paloverde, Saguaro National Park (Rincon Mountain District), Arizona
Hanging cholla, Saguaro National Park (Rincon Mountain District). Public domain scan of drawing, botanical illustration, free to use, no copyright restrictions image - Picryl description
Billy B onstage at the BioBlitz
BioBlitz flag Public domain photograph by National Parks Administration, nature conservation, tourism, free to use, no copyright restrictions image - Picryl description
Ecologist Evan Gwilliam and youth ambassador Dara examining an owl pellet.
Thornscrub biome, Saguaro National Park Public domain photograph by National Parks Administration, nature conservation, tourism, free to use, no copyright restrictions image - Picryl description
Desert biome with creosote, Saguaro National Park, Rincon Mtn District
Temperate forest, Saguaro National Park, Rincon Mtn District
Aspen grove, Saguaro National Park Public domain photograph of timber industry, lumber, free to use, no copyright restrictions image - Picryl description
Featherplume at Montezuma Well Public domain photograph by National Parks Administration, nature conservation, tourism, free to use, no copyright restrictions image - Picryl description
The saguaro (pronounced sə-ˈwär-ə) is a tree-like cactus that can reach over 70 feet in height!
Semidesert biome with grasses and shrubs on hillside
Interior chaparral, Saguaro National Park, Rincon District Public domain photograph of hiking trail, National Parks tourism, free to use, no copyright restrictions image - Picryl description
Kristan Culbert, 2014, Mosaics in Science Program participant measuring turbidity in tinajas at Saguaro National Park, Arizona.
True to its name the cactus wren (campylorhynchus brunneicapillus) builds nests in cactus plants, sometimes in a hole in a saguaro or sometimes where its nest will be protected by prickly cactus spines of a cho More
Jumping spiders are the only spiders that use their eyes to help them hunt! They have some of the best vision among arthropods and use it in courtship, hunting and even navigation. Other spiders primarily use o More
Desert biome with nixed cacti, Saguaro National Park, Tucson Mtn District
Thornscrub biome; shrubs and trees on hillside Public domain photograph of hiking trail, National Parks tourism, free to use, no copyright restrictions image - Picryl description
Although rare, the antelope jackrabbit can be distinguished from the more common black-tailed jackrabbits (Lepus californicus) by their larger size, lack of black ear tips and a broad white patch on their flank More
Members from the University of Arizona Alpha Phi Omega chapter surveyed saguaros on Plot 32 for the Centennial Saguaro Survey program.
Next Generation Rangers and other Resource Management staff surveyed saguaros on Plot 41C for the Centennial Saguaro Survey program.
Students from Tucson Magnet High School surveyed saguaros on Plot 75G for the Centennial Saguaro Survey program.