Mill Valley

Ecosystem Overview

The Mill Valley ecosystem supports 100 documented wildlife species across 90 taxonomic genera. Located in Marin County, California, this area provides critical habitat with diverse natural communities. The location hosts 21 frequently observed species and 19 occasionally documented species, creating a balanced ecosystem with both resident and visiting wildlife. This location ranks #3 for species diversity among 31 Marin County County natural areas, placing it in the 90th percentile for biodiversity.

Biodiversity Highlights

100

Total Species

Documented wildlife species

Genus Diversity

Taxonomic genera represented

Common Species

Frequently observed species

Rare Species

Occasionally documented species

Regional Rank

Out of 31 locations

Species Distribution

Very Common21 species

Common30 species

Occasional30 species

Rare19 species

Regional Context

Regional Ranking

#3 of 31 locations

90th percentile for diversity

vs. Marin County

0% species diversity

Ecosystem Overview

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Biodiversity Highlights

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Species Distribution

Very Common‌

Common‌

Occasional‌

Rare‌

Regional Context

Regional Ranking

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Most Common Species

Showing 20 most frequently observed species out of 100 total documented species.

Ariolimax buttoni

Very Common10 obs.

Egretta thula

Snowy Egret

Very Common10 obs.

Himantopus mexicanus

Black-necked Stilt

Very Common9 obs.

Cytisus scoparius

Scotch broom

Very Common7 obs.

Lysimachia arvensis

Poor Man'S Weatherglass

Very Common7 obs.

Whipplea modesta

Common6 obs.

Foeniculum vulgare

Sweet fennel

Common6 obs.

Trillium ovatum

Western White Wakerobin

Common6 obs.

Genista monspessulana

French broom

Common6 obs.

Lupinus nanus

Orean blue lupin

Common5 obs.

Frankenia salina

Alkali seaheath

Common5 obs.

Sequoia sempervirens

coast redwood

Occasional5 obs.

Tringa melanoleuca

Greater Yellowlegs

Occasional5 obs.

Ranunculus muricatus

Spinyfruit buttercup

Occasional5 obs.

Jaumea carnosa

marsh jaumea

Occasional5 obs.

Sixalix atropurpurea

Sweet Scabious

Occasional5 obs.

Corvus brachyrhynchos

American Crow

Occasional5 obs.

Lysimachia latifolia

broad-leaved starflower

Rare5 obs.

Toxicoscordion fremontii

Fremont's death camas

Rare4 obs.

Cathartes aura

Turkey Vulture

Rare4 obs.

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Most Common Species

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Get Your Personalized Field Guide

Download a professional PDF field guide featuring all the species found in Mill Valley. Perfect for outdoor adventures, education, and nature exploration.

$6.99

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Download a professional PDF field guide featuring all the species found in Mill Valley. Perfect for outdoor adventures, education, and nature exploration.

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Regional Comparison

Regional Ranking

100

Species Count

+14%

vs. Regional Average

Compared to 8 nearby locations in Marin County County, California

Nearby Natural Areas

Marin County

Importance: 0.49

100 species

0% vs. current

San Rafael

Importance: 0.46

100 species

0% vs. current

Novato

Importance: 0.45

100 species

0% vs. current

Sausalito

Importance: 0.45

100 species

0% vs. current

Larkspur

Importance: 0.42

100 species

0% vs. current

San Anselmo

Importance: 0.41

100 species

0% vs. current

Tiburon

Importance: 0.39

100 species

0% vs. current

Tomales

Importance: 0.36

1 species

+9900% vs. current

About This Comparison

These comparisons are based on documented wildlife observations from citizen science data. Locations with higher species counts may have more observation activity, different habitat types, or larger coverage areas. Regional rankings help identify biodiversity hotspots and unique natural areas within Marin County County.

Regional Comparison

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Regional Ranking

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Species Count

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vs. Regional Average

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Nearby Natural Areas

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About This Comparison

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Regional Comparison

Regional Ranking

100

Species Count

+14%

vs. Regional Average

Compared to 8 nearby locations in Marin County County, California

Nearby Natural Areas

Marin County

Importance: 0.49

100 species

0% vs. current

San Rafael

Importance: 0.46

100 species

0% vs. current

Novato

Importance: 0.45

100 species

0% vs. current

Sausalito

Importance: 0.45

100 species

0% vs. current

Larkspur

Importance: 0.42

100 species

0% vs. current

San Anselmo

Importance: 0.41

100 species

0% vs. current

Tiburon

Importance: 0.39

100 species

0% vs. current

Tomales

Importance: 0.36

1 species

+9900% vs. current

About This Comparison

Ecosystem Overview

Biodiversity Highlights

100

Total Species

Documented wildlife species

Genus Diversity

Taxonomic genera represented

Common Species

Frequently observed species

Rare Species

Occasionally documented species

Regional Rank

Out of 31 locations

Species Distribution

Very Common21 species

Common30 species

Occasional30 species

Rare19 species

Regional Context

Regional Ranking

#3 of 31 locations

90th percentile for diversity

vs. Marin County

0% species diversity

Most Common Species

Showing 20 most frequently observed species out of 100 total documented species.

Ariolimax buttoni

Very Common10 obs.

Egretta thula

Snowy Egret

Very Common10 obs.

Himantopus mexicanus

Black-necked Stilt

Very Common9 obs.

Cytisus scoparius

Scotch broom

Very Common7 obs.

Lysimachia arvensis

Poor Man'S Weatherglass

Very Common7 obs.

Whipplea modesta

Common6 obs.

Foeniculum vulgare

Sweet fennel

Common6 obs.

Trillium ovatum

Western White Wakerobin

Common6 obs.

Genista monspessulana

French broom

Common6 obs.

Lupinus nanus

Orean blue lupin

Common5 obs.

Frankenia salina

Alkali seaheath

Common5 obs.

Sequoia sempervirens

coast redwood

Occasional5 obs.

Tringa melanoleuca

Greater Yellowlegs

Occasional5 obs.

Ranunculus muricatus

Spinyfruit buttercup

Occasional5 obs.

Jaumea carnosa

marsh jaumea

Occasional5 obs.

Sixalix atropurpurea

Sweet Scabious

Occasional5 obs.

Corvus brachyrhynchos

American Crow

Occasional5 obs.

Lysimachia latifolia

broad-leaved starflower

Rare5 obs.

Toxicoscordion fremontii

Fremont's death camas

Rare4 obs.

Cathartes aura

Turkey Vulture

Rare4 obs.

Want the Complete Field Guide?

Get all 100 species with 3-4 high-quality images each, detailed descriptions, and a downloadable PDF for offline use.

Premium field guide includes identification tips, seasonal patterns, and professional layout optimized for field use.