How Removing Rats Helped to Save Midway’s Seabirds

A project to remove invasive rats from Midway Atoll in 1995 left the island to flourish, but invasive mice continue to threaten native seabirds.

By: Aaron Ochoa

Midway Atoll National Wildlife Refuge and Battle of Midway National Memorial is a place of immense ongoing conservation and restoration work. Millions of seabirds depend on the atoll as place to breed and nest. Island habitats like Midway are complex and delicate ecological systems and vital for the Hawaiian seabird populations. Invasive species threaten these unique native habitats and wildlife. The impacts from introduced invasive species like rodents carry huge ecological consequences for native habitats and seabird colonies.


June is a special time on Midway. As albatross chicks take up summer residence, they appear to cover every inch of Midway. Credit: Kristy Lapenta/USFWS

As people started to explore and visit the Pacific Islands, so began the expansion of invasive species. Rats had many opportunities to make their journey to several Pacific Islands. Whether hitchhiking with the first Polynesian explorers, guano traders, or military vessels, rats have opportunistically used humans to find their way to the islands.

Rats are omnivorous. They will eat whatever is available to them from bird eggs and insects to plants and seeds. They are able to survive in almost all habitat types and rapidly reproduce. With no native predators in Hawai’i and the Pacific Islands, nesting seabirds have lost behavioral adaptations to defend themselves against predators. Introduced rats are one of the biggest threats to native species on islands.

Bonin Petrels are especially susceptible to rodents. These petrels lay a single egg in burrows underground. Prior to 1943, Midway Atoll’s Bonin Petrel population was estimated at over 500,000 individuals. After the unintended introduction of rats, their population plummeted to less than 5000 by the 1980’s.


A Bonin Petrel in the sand. Credit: Wes Jolley/Island Conservation

Recognizing the wide range of impacts posed by rats, the U.S. Navy funded a rat eradication project in 1995.The U.S. Fish and Wildlife Service (USFWS) worked with the Department of Agriculture (APHIS-Wildlife Services) to eradicate rats. The project was a success and Midway was declared rat-free in 1996.

In the absence of rats, some of Midway’s smaller inhabitants and plants began to flourish. Today, Bonin Petrel populations are numerous and have rebounded since rats were eradicated. Midway’s Eastern Island now as compared to the early 1990s is a landscape covered with wildlife. However, the lasting effects go beyond only wildlife.


Black-footed Albatross and chick. Credit: Kristy Lapenta/USFWS

Native plants are essential for an ecosystem to recover. Rats consume plants and seeds, especially succulent native plants commonly found on islands. They can reduce the diversity of plant life. Rats help invasive plants spread and establish into areas once occupied by native plants. Plants like the native Naupaka, Hawai’i’s most common beach plant, were eaten into submission. However, with rats gone and a successful restoration program, the Naupaka is healthy and prevalent once again on Midway.

Along with the Black Rat, Midway also saw the introduction of the House Mouse. Just as with their larger cousin, mice have adapted to this unique ecological niche on Midway. In 2015/2016 albatross surveys, researchers found a growing presence of mice on the island. More concerning, staff and volunteers have found evidence of mice predating on albatross. The Service continues to observe and monitor groups of albatross throughout the island to gain a further understanding of the mice.

Seabirds face many challenges – invasive species, marine debris, loss of natural habitats, avian malaria. As a refuge and habitat, Midway’s importance spans more than the potential life contained to its shores. The island directly contributes to the overall existence of many seabirds to include over 19 species of birds. Midway is a place of immense historically significance and cultural meaning, and is also a home and refuge for native plants, countless seabirds, and wildlife.

Featured photo: Laysan Albatross egg on Midway Atoll. Credit: Wes Jolley/Island Conservation
Originally printed in USFWS Pacific Region Tumblr

About Island Conservation

Island Conservation prevents extinctions by removing invasive species from islands. To date, we have successfully restored 64 islands worldwide, benefiting 1195 populations of 487 species and subspecies. Working together with local communities, government management agencies, and conservation organizations, we select islands that have the greatest potential for preventing the extinction of globally threatened species.

View All Posts

Follow Island Conservation on Social Media

[ism-social-followers list='fb,tw,li,youtube,instagram' template='ism_template_sf_1' list_align='horizontal' display_counts='false' display_full_name='true' box_align='center' ]

[ism-social-followers list='fb,tw,li,youtube,instagram' template='ism_template_sf_1' list_align='horizontal' display_counts='false' display_full_name='true' box_align='center' ]

Midway Atoll conservation




%d bloggers like this:

select cbd what is cbd full spectrum hash oil cbd at cvs natural healthy cbd cbd oil for mental health cbd oil hemp bomb elixinol cbd reviews what is cbd oil used to treat cbd oil forums cbd y thc juntos cbd hand lotion wellington cbd apartments rent cbd strains for depression cbd for skin care cbd for hair growth cbd delivery does cbd really help with anxiety flora cbd oil cbd oil hemp gummies cbd oil hemp georgia state laws la ferme du cbd cbd shower gel cbd oil candles cbd tincture vs cbd oil madison cbd oil peoples pharmacy cbd oil

penis enlargement scam prostate cancer male enhancement real penis enlargement spell stories vicerex male enhancement pills that make you stay hard longer sex stimulants pills magic blue diamond ed pills black market male enhancement pills drugs that are pills steve harvey ed pills that work over the counter energy pills red black ant sex pills aging male pills cockstar male enhancement pills magnesium for male enhancement testovital enhancement nice penis enlargement system vasodilator supplements for ed you want some penis enlarging pills man up now pills review indian nabbed for making sex pills joel evl supplements cooper hefners son sex pills penis enlargement subscription vi x supplement clamping concepts penis enlargement

best weight loss pills no caffeine cat renal diet weight loss keto diet pills at target diet plan weight loss 7 days urdu keto diet recipes and meal plans anti depression pills that cause weight loss how to lose weight with fruit diet best 30 minute diet cookbook for weight loss what to eliminate from your diet to lose weight medi weight loss diet vegetarian plan daily diet food chart for weight loss diet foods to eat to lose weight drug test for weight loss surgery miso diet weight loss chineese red green and blue weight loss pills does omega 3 pills help with weight loss best weight loss pills after gastric bypass how to lose weight on a vegetarian diet plan weight loss pills houston texas liquid juice diet weight loss 600 lbs weight loss diet how to take water pills to lose weight easy no cooking weight loss diet plan newest weight loss supplement does turmeric pills help you lose weight fitness beauty chinese pills for weight loss