HAWAIʻI
UNGULATES

The History of Introduced Ungulates in Hawaiʻi
Short history
HawaiÊ»i’s unique island ecosystems evolved in isolation over millions of years, leading to the establishment of thousands of flora and fauna found nowhere else on Earth. However, the introduction of non-native species has severely disrupted these ecological systems. Hooved mammals (ungulates) were brought to the Hawaiian Islands at various times by Polynesian voyagers, European colonizers, and government efforts. These introductions occurred over centuries and were often driven by agricultural, economic, or cultural purposes. Today, these invasive mammals pose a serious threat to HawaiÊ»i’s biodiversity, watersheds, and agriculture.
Wild Pig (Sus scrofa)​
~1000 YA
Polynesian Introduction
1778
Captain Cook introduced English pigs to Hawaiʻi, landing a boar and sow on Niʻihau

Feral Goat (Capra hircus)
1778
Captain Cook introduced one ram and two ewes to Niihau
1910
All goats were eradicated from Niihau
1931
Reports indicate about 150 goats on Oahu and 75,000 on the island of Hawaii

Feral Sheep (Ovis aries)
1791
First documented introduction of sheep (one ram, two ewes) by Captain James Colnett to Kauai
1793
Captain George Vancouver introduced a ram, two ewes, and a lamb to Hawaii Island
1934
Efforts to control sheep on Mauna Kea as they now numbered over 40,000
1949
As low as 500 animals remained on Hawaii island, in response a closed season on sheep was enacted
1958
Feral sheep now numbered around 3,000 on Hawaii Island
1962
Feral sheep population on Hawaii island reduced to about 1,100 animals
1979
A court decision ordered all feral sheep and goats be removed on Mauna Kea
Feral Cattle (Bos taursus)
1793
Captain George Vancouver brought the first cattle to Hawaii Island
1962
Feral cattle was eradicated from Oahu


Axis Dear (Axis axis)
1868
Three bucks, four does, and a male fawn arrived at Kamehameha V private lands on Molokai
~1890
Molokai herd now numbered in the thousands
1920
A group of 12 deer were introduced to Lanai
1938
About 1000 herds of deer were present on Oahu but became very scarce by 1950
1954
Public hunting permitted on Lanai in 1954 and Molokai in 1959
1960
Axis deer were released by legislative mandate on Maui
Mouflon Sheep (Ovis aries musimon)
1954
First introduction to the island of Lanai
1958
Four mouflon released on Kauai although did not establish
1964
Mouflon population now numbered around 200 animals
1980
Mouflon number in the hundreds on Hawaii island and nearly 900 on Lanai

Black-tailed Deer (Odocoileus hemionus)
1961
First introduction of ten black-tailed deer from Oregon to Polihale Ridge on Kauai for game management
Additional releases of 10 individuals
1962
1966
Additional releases of 15 individuals

Current Distribution of Naturalized Ungulate Species
