What do these ranks mean? ORBIC's ranking definitions

Yuma Skipper

Yuma Skipper

Ochlodes yuma

List 2S2
Woodhouse's Toad

Woodhouse's Toad

Anaxyrus woodhousii

List 2S2
Northern Leopard Frog

Northern Leopard Frog

Lithobates pipiens

List 2S1
Winged Floater

Winged Floater

Anodonta nuttalliana

List 3S2?
Oregon Floater

Oregon Floater

Anodonta oregonensis

List 2S3?

Horned Grebe

Podiceps auritus

List 2S2B,S5N
Western Ridged Mussel

Western Ridged Mussel

Gonidea angulata

List 1S2S3
Clark's Grebe

Clark's Grebe

Aechmophorus clarkii

List 4S3B,S2N
Western Pearlshell

Western Pearlshell

Margaritifera falcata

List 2S3
Least Bittern

Least Bittern

Botaurus exilis

List 3S1B
Snowy Egret

Snowy Egret

Egretta thula

List 2S2B
White-Faced Ibis

White-Faced Ibis

Plegadis chihi

List 4S3B

Shortface Lanx

Fisherola nuttalli

List 1S1S2

Tule White-Fronted Goose

Anser albifrons elgasi

List 4S2S3N
Brant

Brant

Branta bernicla

List 4S2N
Barrow's Goldeneye

Barrow's Goldeneye

Bucephala islandica

List 4S3B,S3N
Bufflehead

Bufflehead

Bucephala albeola

List 2S2B,S5N
Bald Eagle

Bald Eagle

Haliaeetus leucocephalus

List 4S4B,S4N

Sullivan's Sulphur

Colias occidentalis sullivani

List 1S2
Suckley's Cuckoo Bumblebee

Suckley's Cuckoo Bumblebee

Bombus suckleyi

List 2S1?
Morrison Bumblebee

Morrison Bumblebee

Bombus morrisoni

List 2S2
American Peregrine Falcon

American Peregrine Falcon

Falco peregrinus anatum

List 4S3
Western Monarch

Western Monarch

Danaus plexippus pop. 1

List 1S1S2B
Western Bumblebee

Western Bumblebee

Bombus occidentalis

List 2S2
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