Walnut Creek

Ecosystem Overview

The Walnut Creek ecosystem supports 100 documented wildlife species across 89 taxonomic genera. Located in Contra Costa 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 #10 for species diversity among 45 Contra Costa County County natural areas, placing it in the 78th 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

#10

Regional Rank

Out of 45 locations

Species Distribution

Very Common21 species

Common30 species

Occasional30 species

Rare19 species

Regional Context

Regional Ranking

#10 of 45 locations

78th percentile for diversity

vs. Contra Costa 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.

Anas platyrhynchos

mallard

Very Common183 obs.

Bucephala albeola

Bufflehead

Very Common183 obs.

Haemorhous mexicanus

House Finch

Very Common182 obs.

Branta canadensis

Canada goose

Very Common176 obs.

Zonotrichia atricapilla

Golden-crowned Sparrow

Very Common146 obs.

Sayornis nigricans

black phoebe

Common145 obs.

Aythya collaris

Ring-necked Duck

Common142 obs.

Baeolophus inornatus

Oak Titmouse

Common140 obs.

Setophaga coronata

Myrtle Warbler

Common131 obs.

Melanerpes formicivorus

Acorn Woodpecker

Common125 obs.

Calypte anna

Anna's Hummingbird

Common110 obs.

Spinus psaltria

lesser goldfinch

Occasional106 obs.

Sceloporus occidentalis

Pacific blue-bellied lizard

Occasional100 obs.

Zenaida macroura

Mourning Dove

Occasional99 obs.

Nycticorax nycticorax

night heron, black-crowned night heron

Occasional97 obs.

Sialia mexicana

Western Bluebird

Occasional96 obs.

Zonotrichia leucophrys

white-crowned sparrow

Occasional95 obs.

Junco hyemalis

dark-eyed junco

Rare89 obs.

Sitta carolinensis

White-Breasted Nuthatch (Interior West)

Rare86 obs.

Podilymbus podiceps

Pied-billed grebe

Rare85 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 Walnut Creek. Perfect for outdoor adventures, education, and nature exploration.

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Regional Comparison

Regional Ranking

100

Species Count

+22%

vs. Regional Average

Compared to 8 nearby locations in Contra Costa County County, California

Nearby Natural Areas

Contra Costa County

Importance: 0.49

100 species

0% vs. current

Richmond

Importance: 0.49

100 species

0% vs. current

Concord

Importance: 0.46

100 species

0% vs. current

Antioch

Importance: 0.44

100 species

0% vs. current

Moraga

Importance: 0.43

47 species

+113% vs. current

Orinda

Importance: 0.43

100 species

0% vs. current

Pittsburg

Importance: 0.43

11 species

+809% vs. current

Danville

Importance: 0.43

100 species

0% 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 Contra Costa 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

+22%

vs. Regional Average

Compared to 8 nearby locations in Contra Costa County County, California

Nearby Natural Areas

Contra Costa County

Importance: 0.49

100 species

0% vs. current

Richmond

Importance: 0.49

100 species

0% vs. current

Concord

Importance: 0.46

100 species

0% vs. current

Antioch

Importance: 0.44

100 species

0% vs. current

Moraga

Importance: 0.43

47 species

+113% vs. current

Orinda

Importance: 0.43

100 species

0% vs. current

Pittsburg

Importance: 0.43

11 species

+809% vs. current

Danville

Importance: 0.43

100 species

0% 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

#10

Regional Rank

Out of 45 locations

Species Distribution

Very Common21 species

Common30 species

Occasional30 species

Rare19 species

Regional Context

Regional Ranking

#10 of 45 locations

78th percentile for diversity

vs. Contra Costa County

0% species diversity

Most Common Species

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

Anas platyrhynchos

mallard

Very Common183 obs.

Bucephala albeola

Bufflehead

Very Common183 obs.

Haemorhous mexicanus

House Finch

Very Common182 obs.

Branta canadensis

Canada goose

Very Common176 obs.

Zonotrichia atricapilla

Golden-crowned Sparrow

Very Common146 obs.

Sayornis nigricans

black phoebe

Common145 obs.

Aythya collaris

Ring-necked Duck

Common142 obs.

Baeolophus inornatus

Oak Titmouse

Common140 obs.

Setophaga coronata

Myrtle Warbler

Common131 obs.

Melanerpes formicivorus

Acorn Woodpecker

Common125 obs.

Calypte anna

Anna's Hummingbird

Common110 obs.

Spinus psaltria

lesser goldfinch

Occasional106 obs.

Sceloporus occidentalis

Pacific blue-bellied lizard

Occasional100 obs.

Zenaida macroura

Mourning Dove

Occasional99 obs.

Nycticorax nycticorax

night heron, black-crowned night heron

Occasional97 obs.

Sialia mexicana

Western Bluebird

Occasional96 obs.

Zonotrichia leucophrys

white-crowned sparrow

Occasional95 obs.

Junco hyemalis

dark-eyed junco

Rare89 obs.

Sitta carolinensis

White-Breasted Nuthatch (Interior West)

Rare86 obs.

Podilymbus podiceps

Pied-billed grebe

Rare85 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.