What do these ranks mean? ORBIC's ranking definitions

Clouded Salamander

Clouded Salamander

Aneides ferreus

List 4S3S4
California Slender Salamander

California Slender Salamander

Batrachoseps attenuatus

List 4S3
Oregon Slender Salamander

Oregon Slender Salamander

Batrachoseps wrighti

List 4S3
Del Norte Salamander

Del Norte Salamander

Plethodon elongatus

List 4S3
Larch Mountain Salamander

Larch Mountain Salamander

Plethodon larselli

List 2S2?
Siskiyou Mountains Salamander

Siskiyou Mountains Salamander

Plethodon stormi

List 1S2

Crater Lake Newt

Taricha granulosa mazamae

List 1S1
Cope's Giant Salamander

Cope's Giant Salamander

Dicamptodon copei

List 2S2?
Southern Torrent Salamander

Southern Torrent Salamander

Rhyacotriton variegatus

List 4S3?
Cascade Torrent Salamander

Cascade Torrent Salamander

Rhyacotriton cascadae

List 2S2S3
Columbia Torrent Salamander

Columbia Torrent Salamander

Rhyacotriton kezeri

List 2S2S3
Coastal Tailed Frog

Coastal Tailed Frog

Ascaphus truei

List 4S3
Woodhouse's Toad

Woodhouse's Toad

Anaxyrus woodhousii

List 2S2
Northern Red-Legged Frog

Northern Red-Legged Frog

Rana aurora

List 4S3S4
Foothill Yellow-Legged Frog

Foothill Yellow-Legged Frog

Rana boylii

List 2S2S3
Cascades Frog

Cascades Frog

Rana cascadae

List 4S3
Northern Leopard Frog

Northern Leopard Frog

Lithobates pipiens

List 2S1

Horned Grebe

Podiceps auritus

List 2S2B,S5N

Red-Necked Grebe

Podiceps grisegena

List 2S1B,S4N
Clark's Grebe

Clark's Grebe

Aechmophorus clarkii

List 4S3B,S2N
Fork-Tailed Storm-Petrel

Fork-Tailed Storm-Petrel

Hydrobates furcatus

List 2S2B
California Brown Pelican

California Brown Pelican

Pelecanus occidentalis californicus

List 2S2N
Pelagic Cormorant

Pelagic Cormorant

Urile pelagicus

List 4S3
Least Bittern

Least Bittern

Botaurus exilis

List 3S1B
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