Mill River

Ecosystem Overview

The Mill River ecosystem supports 29 documented wildlife species across 28 taxonomic genera. Located in New Haven County, Connecticut, this area provides critical habitat with diverse natural communities. The location hosts 6 frequently observed species and 5 occasionally documented species, creating a balanced ecosystem with both resident and visiting wildlife. While New Haven nearby has 71% more documented species, Mill River offers unique wildlife observation opportunities. This location ranks #8 for species diversity among 21 New Haven County County natural areas, placing it in the 62th 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 Common6 species

Common9 species

Occasional9 species

Rare5 species

Regional Context

Regional Ranking

#8 of 21 locations

62th percentile for diversity

vs. New Haven

-71% species diversity

Ecosystem Overview

‌
‌
‌
‌

Biodiversity Highlights

‌

Species Distribution

Very Common‌

Common‌

Occasional‌

Rare‌

Regional Context

Regional Ranking

‌

Most Common Species

Showing 20 most frequently observed species out of 29 total documented species.

Sayornis phoebe

Eastern Phoebe

Very Common2 obs.

Vireo gilvus

Warbling Vireo (Western)

Very Common2 obs.

Mniotilta varia

Black-and-white Warbler

Very Common2 obs.

Euonymus alatus

Winged Euonymus

Very Common2 obs.

Enallagma exsulans

Stream Bluet

Very Common2 obs.

Libellula incesta

Slaty Skimmer

Common1 obs.

Libellula vibrans

Great Blue Skimmer

Common1 obs.

Trachemys scripta

slider turtle, red-eared terrapin, red-eared slider

Common1 obs.

Tringa melanoleuca

Greater Yellowlegs

Common1 obs.

Actitis macularius

spotted sandpiper

Common1 obs.

Quiscalus quiscula

Common Grackle

Common1 obs.

Cardinalis cardinalis

Northern Cardinal

Occasional1 obs.

Hylocichla mustelina

Wood Thrush

Occasional1 obs.

Melospiza melodia

Song Sparrow

Occasional1 obs.

Dumetella carolinensis

Catbird

Occasional1 obs.

Megascops asio

Eastern Screech-Owl

Occasional1 obs.

Hydnoporia olivacea

Occasional1 obs.

Erythronium americanum

trout-lily

Rare1 obs.

Pontederia cordata

pickerelweed

Rare1 obs.

Artemisia vulgaris

mugwort

Rare1 obs.

Want the Complete Field Guide?

Get all 29 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.

Most Common Species

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

Want the Complete Field Guide?

‌
‌

‌

Get Your Personalized Field Guide

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

$6.99

Get Your Personalized Field Guide

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

Email Address (for delivery)

Your field guide will be delivered to this email address. Please double-check for accuracy.

$6.99

Regional Comparison

Regional Ranking

Species Count

-56%

vs. Regional Average

Compared to 8 nearby locations in New Haven County County, Connecticut

Nearby Natural Areas

New Haven

Importance: 0.55

100 species

-71% vs. current

Meriden

Importance: 0.44

100 species

-71% vs. current

New Haven County

Importance: 0.42

100 species

-71% vs. current

Hamden

Importance: 0.35

100 species

-71% vs. current

North Haven

Importance: 0.35

100 species

-71% vs. current

Branford Supply Pond

Importance: 0.35

14 species

+107% vs. current

Baldwins Pond

Importance: 0.35

10 species

+190% vs. current

Iris Pond

Importance: 0.35

4 species

+625% 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 New Haven County County.

Regional Comparison

‌

Regional Ranking

‌

Species Count

‌

vs. Regional Average

‌

Nearby Natural Areas

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

About This Comparison

‌
‌
‌

Regional Comparison

Regional Ranking

Species Count

-56%

vs. Regional Average

Compared to 8 nearby locations in New Haven County County, Connecticut

Nearby Natural Areas

New Haven

Importance: 0.55

100 species

-71% vs. current

Meriden

Importance: 0.44

100 species

-71% vs. current

New Haven County

Importance: 0.42

100 species

-71% vs. current

Hamden

Importance: 0.35

100 species

-71% vs. current

North Haven

Importance: 0.35

100 species

-71% vs. current

Branford Supply Pond

Importance: 0.35

14 species

+107% vs. current

Baldwins Pond

Importance: 0.35

10 species

+190% vs. current

Iris Pond

Importance: 0.35

4 species

+625% 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 Common6 species

Common9 species

Occasional9 species

Rare5 species

Regional Context

Regional Ranking

#8 of 21 locations

62th percentile for diversity

vs. New Haven

-71% species diversity

Most Common Species

Showing 20 most frequently observed species out of 29 total documented species.

Sayornis phoebe

Eastern Phoebe

Very Common2 obs.

Vireo gilvus

Warbling Vireo (Western)

Very Common2 obs.

Mniotilta varia

Black-and-white Warbler

Very Common2 obs.

Euonymus alatus

Winged Euonymus

Very Common2 obs.

Enallagma exsulans

Stream Bluet

Very Common2 obs.

Libellula incesta

Slaty Skimmer

Common1 obs.

Libellula vibrans

Great Blue Skimmer

Common1 obs.

Trachemys scripta

slider turtle, red-eared terrapin, red-eared slider

Common1 obs.

Tringa melanoleuca

Greater Yellowlegs

Common1 obs.

Actitis macularius

spotted sandpiper

Common1 obs.

Quiscalus quiscula

Common Grackle

Common1 obs.

Cardinalis cardinalis

Northern Cardinal

Occasional1 obs.

Hylocichla mustelina

Wood Thrush

Occasional1 obs.

Melospiza melodia

Song Sparrow

Occasional1 obs.

Dumetella carolinensis

Catbird

Occasional1 obs.

Megascops asio

Eastern Screech-Owl

Occasional1 obs.

Hydnoporia olivacea

Occasional1 obs.

Erythronium americanum

trout-lily

Rare1 obs.

Pontederia cordata

pickerelweed

Rare1 obs.

Artemisia vulgaris

mugwort

Rare1 obs.

Want the Complete Field Guide?

Get all 29 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.