Contra Costa County

Ecosystem Overview

The Contra Costa County ecosystem supports 100 documented wildlife species across 92 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 #4 for species diversity among 45 Contra Costa County County natural areas, placing it in the 91th 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 45 locations

Species Distribution

Very Common21 species

Common30 species

Occasional30 species

Rare19 species

Regional Context

Regional Ranking

#4 of 45 locations

91th percentile for diversity

vs. Richmond

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.

Buteo jamaicensis

Red-tailed Hawk

Very Common497 obs.

Sayornis nigricans

black phoebe

Very Common480 obs.

Sialia mexicana

Western Bluebird

Very Common476 obs.

Anas platyrhynchos

mallard

Very Common439 obs.

Zonotrichia atricapilla

Golden-crowned Sparrow

Very Common427 obs.

Calypte anna

Anna's Hummingbird

Common425 obs.

Sceloporus occidentalis

Pacific blue-bellied lizard

Common413 obs.

Haemorhous mexicanus

House Finch

Common396 obs.

Spinus psaltria

lesser goldfinch

Common393 obs.

Melanerpes formicivorus

Acorn Woodpecker

Common392 obs.

Aphelocoma californica

California/Woodhouse's Scrub-Jay

Common390 obs.

Junco hyemalis

dark-eyed junco

Occasional379 obs.

Branta canadensis

Canada goose

Occasional374 obs.

Taricha torosa

California Newt

Occasional365 obs.

Bucephala albeola

Bufflehead

Occasional342 obs.

Zonotrichia leucophrys

white-crowned sparrow

Occasional332 obs.

Cathartes aura

Turkey Vulture

Occasional313 obs.

Setophaga coronata

Myrtle Warbler

Rare303 obs.

Meleagris gallopavo

Turkey

Rare288 obs.

Ardea alba

Great Egret

Rare286 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 Contra Costa County. Perfect for outdoor adventures, education, and nature exploration.

$6.99

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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

Richmond

Importance: 0.49

100 species

0% vs. current

Concord

Importance: 0.46

100 species

0% vs. current

Walnut Creek

Importance: 0.45

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

Richmond

Importance: 0.49

100 species

0% vs. current

Concord

Importance: 0.46

100 species

0% vs. current

Walnut Creek

Importance: 0.45

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

Regional Rank

Out of 45 locations

Species Distribution

Very Common21 species

Common30 species

Occasional30 species

Rare19 species

Regional Context

Regional Ranking

#4 of 45 locations

91th percentile for diversity

vs. Richmond

0% species diversity

Most Common Species

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

Buteo jamaicensis

Red-tailed Hawk

Very Common497 obs.

Sayornis nigricans

black phoebe

Very Common480 obs.

Sialia mexicana

Western Bluebird

Very Common476 obs.

Anas platyrhynchos

mallard

Very Common439 obs.

Zonotrichia atricapilla

Golden-crowned Sparrow

Very Common427 obs.

Calypte anna

Anna's Hummingbird

Common425 obs.

Sceloporus occidentalis

Pacific blue-bellied lizard

Common413 obs.

Haemorhous mexicanus

House Finch

Common396 obs.

Spinus psaltria

lesser goldfinch

Common393 obs.

Melanerpes formicivorus

Acorn Woodpecker

Common392 obs.

Aphelocoma californica

California/Woodhouse's Scrub-Jay

Common390 obs.

Junco hyemalis

dark-eyed junco

Occasional379 obs.

Branta canadensis

Canada goose

Occasional374 obs.

Taricha torosa

California Newt

Occasional365 obs.

Bucephala albeola

Bufflehead

Occasional342 obs.

Zonotrichia leucophrys

white-crowned sparrow

Occasional332 obs.

Cathartes aura

Turkey Vulture

Occasional313 obs.

Setophaga coronata

Myrtle Warbler

Rare303 obs.

Meleagris gallopavo

Turkey

Rare288 obs.

Ardea alba

Great Egret

Rare286 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.