Western Addition

Ecosystem Overview

The Western Addition ecosystem supports 83 documented wildlife species across 78 taxonomic genera. Located in San Francisco City and County, California, this area provides critical habitat with diverse natural communities. The location hosts 17 frequently observed species and 16 occasionally documented species, creating a balanced ecosystem with both resident and visiting wildlife. While San Francisco nearby has 17% more documented species, Western Addition offers unique wildlife observation opportunities. This location ranks #4 for species diversity among 21 San Francisco City and County County natural areas, placing it in the 81th percentile for biodiversity.

Biodiversity Highlights

Total Species

Documented wildlife species

Genus Diversity

Taxonomic genera represented

Common Species

Frequently observed species

Rare Species

Occasionally documented species

Regional Rank

Out of 21 locations

Species Distribution

Very Common17 species

Common25 species

Occasional25 species

Rare16 species

Regional Context

Regional Ranking

#4 of 21 locations

81th percentile for diversity

vs. San Francisco

-17% 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 83 total documented species.

Passer domesticus

House Sparrow

Very Common11 obs.

Parietaria judaica

pellitory-of-the-wall

Very Common8 obs.

Trifolium repens

Dutch clover

Very Common8 obs.

Turdus migratorius

American Robin

Very Common8 obs.

Vanessa atalanta

Red Admiral

Very Common6 obs.

Apis mellifera

Western Honey Bee

Common6 obs.

Calypte anna

Anna's Hummingbird

Common5 obs.

Buteo jamaicensis

Red-tailed Hawk

Common5 obs.

Zenaida macroura

Mourning Dove

Common4 obs.

Haemorhous mexicanus

House Finch

Common4 obs.

Bellis perennis

daisy

Common4 obs.

Armillaria mellea

Honey Fungus

Occasional4 obs.

Leratiomyces ceres

Redlead Roundhead

Occasional4 obs.

Aphelocoma californica

California/Woodhouse's Scrub-Jay

Occasional3 obs.

Papilio rutulus

Western Tiger Swallowtail

Occasional3 obs.

Cornu aspersum

Brown garden snail

Occasional3 obs.

Spinus psaltria

lesser goldfinch

Occasional3 obs.

Corvus brachyrhynchos

American Crow

Rare3 obs.

Sabulodes aegrotata

Rare2 obs.

Papilio zelicaon

Western Swallowtail

Rare2 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 Western Addition. Perfect for outdoor adventures, education, and nature exploration.

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Regional Comparison

Regional Ranking

Species Count

+41%

vs. Regional Average

Compared to 8 nearby locations in San Francisco City and County County, California

Nearby Natural Areas

San Francisco

Importance: 0.69

100 species

-17% vs. current

Stow Lake

Importance: 0.35

100 species

-17% vs. current

North Lake

Importance: 0.35

75 species

+11% vs. current

Mountain Lake

Importance: 0.35

60 species

+38% vs. current

Elk Glen Lake

Importance: 0.35

54 species

+54% vs. current

Lily Pond

Importance: 0.35

30 species

+177% vs. current

Mallard Lake

Importance: 0.35

28 species

+196% vs. current

Pine Lake

Importance: 0.35

22 species

+277% 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 San Francisco City and 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

Species Count

+41%

vs. Regional Average

Compared to 8 nearby locations in San Francisco City and County County, California

Nearby Natural Areas

San Francisco

Importance: 0.69

100 species

-17% vs. current

Stow Lake

Importance: 0.35

100 species

-17% vs. current

North Lake

Importance: 0.35

75 species

+11% vs. current

Mountain Lake

Importance: 0.35

60 species

+38% vs. current

Elk Glen Lake

Importance: 0.35

54 species

+54% vs. current

Lily Pond

Importance: 0.35

30 species

+177% vs. current

Mallard Lake

Importance: 0.35

28 species

+196% vs. current

Pine Lake

Importance: 0.35

22 species

+277% vs. current

About This Comparison

Ecosystem Overview

Biodiversity Highlights

Total Species

Documented wildlife species

Genus Diversity

Taxonomic genera represented

Common Species

Frequently observed species

Rare Species

Occasionally documented species

Regional Rank

Out of 21 locations

Species Distribution

Very Common17 species

Common25 species

Occasional25 species

Rare16 species

Regional Context

Regional Ranking

#4 of 21 locations

81th percentile for diversity

vs. San Francisco

-17% species diversity

Most Common Species

Showing 20 most frequently observed species out of 83 total documented species.

Passer domesticus

House Sparrow

Very Common11 obs.

Parietaria judaica

pellitory-of-the-wall

Very Common8 obs.

Trifolium repens

Dutch clover

Very Common8 obs.

Turdus migratorius

American Robin

Very Common8 obs.

Vanessa atalanta

Red Admiral

Very Common6 obs.

Apis mellifera

Western Honey Bee

Common6 obs.

Calypte anna

Anna's Hummingbird

Common5 obs.

Buteo jamaicensis

Red-tailed Hawk

Common5 obs.

Zenaida macroura

Mourning Dove

Common4 obs.

Haemorhous mexicanus

House Finch

Common4 obs.

Bellis perennis

daisy

Common4 obs.

Armillaria mellea

Honey Fungus

Occasional4 obs.

Leratiomyces ceres

Redlead Roundhead

Occasional4 obs.

Aphelocoma californica

California/Woodhouse's Scrub-Jay

Occasional3 obs.

Papilio rutulus

Western Tiger Swallowtail

Occasional3 obs.

Cornu aspersum

Brown garden snail

Occasional3 obs.

Spinus psaltria

lesser goldfinch

Occasional3 obs.

Corvus brachyrhynchos

American Crow

Rare3 obs.

Sabulodes aegrotata

Rare2 obs.

Papilio zelicaon

Western Swallowtail

Rare2 obs.

Want the Complete Field Guide?

Get all 83 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.