Invasive SpeciesGreen crab

Carcinus maenas
FOUND by Damp Water
Cape Elizabeth
ID Confirmed
Quality checked by Ms. Fanning
Peer reviewed by Moody Teenager
Field Notes
At 9:00 AM we stepped off the bus on a crisp and windy day at Kettle Cove Beach in Cape Elizabeth, ME. We were there looking for evidence of the invasive species, the Green Crab. As we breathed in the salty air and felt the strong breeze at our backs, we jumped down off of the bus and onto the rocks. We identified the first crab we saw as the Green Crab. We started sifting through the seaweed and found two very small crabs that weren’t of much use as specimens because they were too small to see any of the most important characteristics, so we didn’t use them for our evidence. Finally, we headed out to the farthest end of the beach where we found a huge crab that we immediately identified as a Green Crab. It had all of the most important characteristics like the five spines, the correct color of the shell, and the fact that it continually pinched us, showing its aggressiveness.
A sketch of our study site.
Supporting Evidence
Photo of my evidence.
We think we found a Green Crab because in the photo you can clearly see the pentagon-shaped shell and the 5 spines, which are characteristics of the Green Crab.
Photo of my evidence.
We think we found the Green Crab because in this picture you can see that it also has the brown and green coloring on the top of its shell.
Photo of my evidence.
We think we found a Green Crab because you can clearly see that It also has thin, sharp-tipped claws. These are all characteristics of the Green Crab.
Species Observation: Species Looked For
Did you find it?: 
I think I found it
Scientific name:
Carcinus maenas
Common name:
Green crab
Sampling method: 
Just looking around
Photo of our sampling method.
Place Studied
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Map this species
N 43.561129 °
W -70.217528 °
Observation Site Information
A photo of our study site.
Coastal - Beach or dune
Trip Information
Kettle Cove
Trip date: 
Tue, 2017-10-24 09:30
Town or city: 
Cape Elizabeth
Type of investigation: 
Species Survey
Time of low tide: 
Tue, 2017-10-24 08:26


Great work identifying the key characteristics of this crab!