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Most Important Colonies by Ratio of the population

Rank

Country

Island

Common Name

Estimate

Ratio of the 

Population

Contributor

1

Bermuda

Nonesuch

Bermuda Petrel

71

1.00

JLM

2

Aruba

Lago Reef

Cayenne Tern

3226

0.84

NOR

3

Haiti

Pic Macaya

Black-capped Petrel

1000

0.50

DSL

4

Aruba

Lago Reef

Black Noddy

48

0.48

NOR

5

Venezuela

Los Roques

Black Noddy

44

0.44

DIA

6

Middle Caicos

Middle Caicos

Royal Tern

270

0.42

PNK

7

Barbuda

Codrington Lagoon

Magnificent Frigatebird

2000

0.33

BAS

8

East Caicos

Northern Coast

Common Tern

200

0.32

PNK

9

Exumas, Bahamas

Long

Audubon's Shearwater

800

0.30

WAM

10

Turks and Caicos

French

Brown Noddy

11000

0.30

PNK

11

Little Cayman

Booby Pond

Red-footed Booby

4832

0.29

PEB

12

Cuba

Sabinal

Gull-billed Tern

70

0.28

JRB

13

Venezuela

Monje  del Sur

Masked Booby

200

0.27

TEB

14

Dominican Rep.

Alto Velo

Sooty Tern

80000

0.25

KTH

15

Andros

Dolly's Rock

Sandwich Tern

400

0.25

NOR

16

Turks and Caicos

Penniston

Bridled Tern

2000

0.22

PNK

17

Jamaica

SE Morant

Sooty Tern

70000

0.22

ASU

18

Venezuela

Los Roques

Brown Pelican

491

0.20

DIA

19

Puerto Rico

La Parguera

Roseate Tern

700

0.19

JES

20

Anguilla

Dog

Brown Booby

1267

0.18

HDA

21

Grenadines

Battowia Bullet

Red-footed Booby

3000

0.18

FLH

22

Anguilla

Scrub

Royal Tern

115

0.18

HDA

23

Venezuela

Los Roques

Common Tern

110

0.18

DIA

24

Anguilla

Prickley Pear E

Laughing Gull

2000

0.16

NAC

25

Turks and Caicos

Long

Brown Noddy

6000

0.16

PNK