{"id":9469,"date":"2026-06-16T07:03:52","date_gmt":"2026-06-16T07:03:52","guid":{"rendered":"https:\/\/digital-desert.com\/blog\/?p=9469"},"modified":"2026-06-16T07:03:52","modified_gmt":"2026-06-16T07:03:52","slug":"arroyo-toad","status":"publish","type":"post","link":"https:\/\/digital-desert.com\/blog\/arroyo-toad\/","title":{"rendered":"Arroyo Toad"},"content":{"rendered":"\n
\"\"
Will Flaxington – USFWS<\/figcaption><\/figure>\n\n\n\n

The arroyo toad is a small, stocky toad of sandy washes, shallow streams, and open riparian terraces. It is not a general desert toad. It depends on a very particular kind of stream: low-gradient water, sandy or fine-gravel bars, shallow pools, and nearby upland soils soft enough for burrowing. The young develop in quiet, shallow water, while adults spend much of the dry season underground.<\/p>\n\n\n\n

In the Mojave region, the arroyo toad belongs to the old drainage system of the San Gabriel and San Bernardino mountains rather than the open desert floor. The U.S. Fish and Wildlife Service recognizes a Desert Recovery Unit in northeastern Los Angeles County and southwestern San Bernardino County.<\/p>\n\n\n\n

Breeding usually occurs from winter into summer when shallow pools are available. Eggs hatch quickly, tadpoles develop in slow water, and young toads remain near drying pools before moving into nearby sandy uplands. During hot, dry months, toads estivate in burrows, emerging in response to moisture or disturbance.<\/p>\n\n\n\n

The arroyo toad remains federally endangered. Its main problems are loss and fragmentation of stream habitat, dams and water diversions, altered flows, non-native predators such as bullfrogs and crayfish, drought, wildfire, and climate change.<\/p>\n\n\n\n

Simple description:<\/p>\n\n\n\n

The arroyo toad is a rare, federally endangered toad found along sandy, shallow streams in parts of central and southern California and northern Baja California. It needs both water and sand: quiet pools for breeding and soft upland soils for burrowing during the dry season. In the desert region, it is tied to mountain-fed washes and riparian corridors, not open dry flats.<\/p>\n\n\n\n

Notes & Additional Reading<\/p>\n\n\n\n

The arroyo toad, Anaxyrus californicus<\/em>, was federally listed as endangered on December 16, 1994. U.S. Fish and Wildlife Service describes it as a species of shallow, slow-moving stream and riparian habitat with nearby sandy or fine-gravel uplands, and lists threats including non-native predators, disease, water withdrawals, urban and agricultural development, pollution, drought, and climate change.<\/p>\n\n\n\n

For desert-region wording, be careful. The species is mainly tied to coastal and mountain drainages of central and southern California and northwestern Baja California, but it also occurs in some desert-associated drainages, including the Mojave River. The San Diego Natural History Museum atlas specifically notes \u201cmore prominent desert drainages, such as the Mojave River.\u201d<\/p>\n\n\n\n

For accuracy on old desert records, use Ervin, Beaman, and Fisher. They found that four reported Sonoran Desert populations from Riverside, San Diego, and Imperial counties were erroneous, which is important when discussing the arroyo toad\u2019s desert range.<\/p>\n\n\n\n

For current conservation and population discussion, use Hitchcock et al. The 2017-2020 range-wide surveys found arroyo toads at 61 of 88 surveyed historical sites and in 20 of 25 historically occupied watersheds, but no detections occurred at nearly one-third of surveyed sites. The paper also emphasizes drought, invasive aquatic species, altered flows, and other human effects as major management concerns.<\/p>\n\n\n\n

For upland habitat, stream terraces, and management, use Gallegos et al. Their radio-telemetry study found that adult toads used open, sandy flats with sparse vegetation and remained on stream terraces during and after breeding; they also warned that assuming toads are absent from floodplain habitat outside the breeding season may leave them vulnerable to disturbance.<\/p>\n\n\n\n

Additional reading:<\/p>\n\n\n\n

U.S. Fish and Wildlife Service. \u201cArroyo Toad (Anaxyrus californicus<\/em>).\u201d Best general source for status, description, habitat, life cycle, range, threats, and recovery context.<\/p>\n\n\n\n

U.S. Fish and Wildlife Service. \u201cArroyo Toad (Anaxyrus californicus<\/em>) 5-Year Review.\u201d Best source for the current federal review status and conservation assessment.<\/p>\n\n\n\n

Hitchcock, C. J., et al. 2022. \u201cRange-wide persistence of the endangered arroyo toad (Anaxyrus californicus<\/em>) for 20+ years following a prolonged drought.\u201d Ecology and Evolution<\/em>. Best recent scientific paper for persistence, drought, and broad survey results.<\/p>\n\n\n\n

Gallegos, E., L. M. Lyren, R. E. Lovich, M. J. Mitrovich, and R. N. Fisher. 2011. \u201cHabitat use and movement of the endangered Arroyo Toad (Anaxyrus californicus<\/em>) in coastal southern California.\u201d Journal of Herpetology<\/em>. Best paper for adult movement, stream terraces, upland use, and management timing.<\/p>\n\n\n\n

Ervin, E. L., K. R. Beaman, and R. N. Fisher. 2013. \u201cCorrection of locality records for the endangered arroyo toad (Anaxyrus californicus<\/em>) from the desert region of southern California.\u201d Bulletin of the Southern California Academy of Sciences<\/em>. Best paper for correcting desert-location errors.<\/p>\n\n\n\n

California Department of Fish and Wildlife \/ UC Davis. California Amphibian and Reptile Species of Special Concern<\/em>. Useful state-level conservation reference; the CDFW page includes the arroyo toad species account under its amphibian and reptile Species of Special Concern publication.<\/p>\n\n\n\n

San Diego Natural History Museum. \u201cAnaxyrus californicus<\/em> \u2014 Arroyo Toad.\u201d Good field-guide style source for identification, range notes, conservation status, and the Mojave River mention.<\/p>\n\n\n\n

San Bernardino Mountains<\/a><\/h2>\n\n\n\n

San Gabriel Mountains<\/a><\/h2>\n\n\n\n

Mojave River<\/a><\/h2>\n\n\n\n

Riparian Habitat<\/a><\/h2>\n\n\n\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

The arroyo toad is a small, stocky toad of sandy washes, shallow streams, and open riparian terraces. It is not a general desert toad. It depends on a very particular kind of stream: low-gradient water, sandy or fine-gravel bars, shallow pools, and nearby upland soils soft enough for burrowing. The young develop in quiet, shallow … Continue reading “Arroyo Toad”<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[215],"tags":[],"class_list":["post-9469","post","type-post","status-publish","format-standard","hentry","category-articles"],"_links":{"self":[{"href":"https:\/\/digital-desert.com\/blog\/wp-json\/wp\/v2\/posts\/9469","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/digital-desert.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/digital-desert.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/digital-desert.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/digital-desert.com\/blog\/wp-json\/wp\/v2\/comments?post=9469"}],"version-history":[{"count":1,"href":"https:\/\/digital-desert.com\/blog\/wp-json\/wp\/v2\/posts\/9469\/revisions"}],"predecessor-version":[{"id":9471,"href":"https:\/\/digital-desert.com\/blog\/wp-json\/wp\/v2\/posts\/9469\/revisions\/9471"}],"wp:attachment":[{"href":"https:\/\/digital-desert.com\/blog\/wp-json\/wp\/v2\/media?parent=9469"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/digital-desert.com\/blog\/wp-json\/wp\/v2\/categories?post=9469"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/digital-desert.com\/blog\/wp-json\/wp\/v2\/tags?post=9469"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}