Island Fox and the Jerusalem Cricket

Island fox pups on the Channel Islands are now about 6 weeks old and about to emerge from the family den. Friends of the Island Fox's Twitter fox, Tani, is learning what to eat. Both the mother and father island fox bring food to their pups. Follow Tani's tweets in the black Twitter box on the right.


Island foxes are omnivorous, they eat both plant food and other animals. Insects are fairly easy to find and they are an important part of an island fox's diet. Jerusalem crickets are a favorite food for island foxes. This large insect can be found in the soil under native plants and it provides a protein-rich meal. Jerusalem crickets are also known as earth babies, ninõs de la tierra or potato bugs (but they don't eat potatoes).

Jerusalem cricket

The island fox, the Catalina cherry and the Jerusalem cricket all depend on each other. The island fox eats the Jerusalem cricket, but it also eats the fruit of the Catalina cherry. The seeds of this plant are too big for the finches and small birds to swallow. But the island fox does swallow some of the seeds and helps to disperse the cherry seeds across the island so new plants can grow. Fox Scat The Jerusalem cricket lives under the Catalina cherry plant and eats some of its roots and dead leaves on the ground. It is a decomposer helping create healthy soil where new plants can grow. The island fox, the Catalina cherry and the Jerusalem cricket are just a small part of the interconnected web of plants and animals on the Channel Islands.


The island fox has evolved to have very pointed teeth so it can pick up small insects. The teeth act like tweezers carefully picking up grasshoppers and crickets, while leaving twigs and leaves behind.


Island foxes also eat the native island deer mice, some small birds and their eggs. As summer comes to the island, fruit will start to play an important role in the what the foxes eat.


Follow along with Tani on Twitter or on Facebook as an island fox grows up.

Bald Eagles and Island Foxes

Tani is learning about the bald eagles on the Channel Islands and you can too. 

photo courtesy of Peter Sharp, IWS

Bald eagles went extinct on the Channel Islands following the use of DDT in Southern California. While this chemical insecticide successfully killed insects around homes and on agricultural crops, it stayed in the environment. The chemical ingredients of DDT take many years to disappear or degrade. They were washed from fields and cities into streams, rivers and eventually the ocean. 


When small animals ate the chemicals, they were in turn eaten by larger animals. Seafloor worms were eaten by fish, and the fish were eaten by the bald eagle and the brown pelican. The chemicals accumulated in top predators like theses large birds. The DDT didn't kill the eagles directly, it caused them to be unable to lay eggs with hard shells. When the mother eagle sat on her eggs they cracked. No eaglets were born and the bald eagles disappeared completely from the Channel Islands.


Today DDT is no longer legally used in the United States. Part of the effort to return the Channel Islands to their natural state was to relocate young bald eagles to Santa Cruz and Santa Catalina Islands. These reintroduced bald eagles have grown-up. They are doing well and reproducing.

You can watch the bald eagles live as they raise their chicks through the on-line EAGLECAM

As of May 1, 2011 the chicks are small gray fluffs in the nest.  They are growing up just as the island fox pups are growing up.

Watch a video from the EAGLECAM where an island fox visits the bald eagle nest.


Follow Tani's adventures as an island fox grows up on Twitter or Facebook.

Follow An Island Fox on TWITTER

Friends of the Island Fox announces the birth of Tani, a special island fox pup on Santa Cruz Island. More on Santa Cruz Island.

This island fox pup will have a voice through Friends of the Island Fox. You'll be able to follow Tani's adventures on Twitter at @ifoxtweet. See the Twitter box in the right hand column below the island fox picture or follow on the Friends of the Island Fox FaceBook page.  

Over the next year this island fox will tweet her experiences as she grows up and explores her island home.


Today Tani and her brother and sister were born in a hillside den. They are each about the size of two AA batteries. Sleep and food are their primary interests and their world revolves around their mother.


Follow @ifoxtweet on Twitter as an island fox grows up.

Spring Is the Time for Island Fox Pups

Spring is blooming across the Channel Islands. The mountain morning glory unfurls its white flowers tinged in pink.

In protective dens across the islands, female island foxes are giving birth to their litters of pups. The green hillsides with their flowers hint that the rainfall has been good this year. If the plants are healthy they will produce abundant fruit this summer. The Catalina cherry, toyon and prickly pear cactus are all important food sources for the island fox. Island fox food. If the plants grow well, the animals that depend on them will do well too.

Last year the drought impacted island foxes. Fewer pups were born and many were underweight. This year we are hoping for healthy island fox pups. Typically island foxes have 2 pups, but if there is abundant food they can have up to 5 pups.

Representatives from Friends of the Island Fox were out on Santa Cruz Island last week. More on Santa Cruz Island. The hillsides were green and the Catalina cherry trees were covered in blooms. We’re looking for a special island fox pup to be born that will be communicating out to the world about its daily life as it grows up.

This exciting birth is just around the corner. We hope that by sharing the daily adventures of this little island fox via Twitter, people around the world will have a better understanding of the challenges the island fox faces living on an island and being an endangered species. (Link to video - island fox encounters bald eagle chick)

Are you ready to follow an island fox pup as it grows up?