An Excellent Year in the Gulf of California


Isla Rasa, Mexico. Photo ©Julia WhittyRasa Island, Mexico. Photo © Julia Whitty

I’m finally back from Mexico’s remote Isla Rasa, a tiny outpost in the Gulf of California and one of the most important seabird breeding islands in the world. The island covers a bare 138 acres/56 hectares. Yet it’s home to half a million birds—many more if it’s a good enough year for the birds to produce eggs, incubate them, and hatch their chicks.

Heermann's gulls and a cardón cactus, both endemic to the Gulf of California and the Baja Peninsula. Photo © Julia Whitty.Heermann’s gulls and a cardón cactus, both endemic to the Gulf of California and the Baja Peninsula. Photo © Julia Whitty.

Some 95 percent of all Heermann’s gulls (Larus heermanni) nest on Isla Rasa. These are small, pretty, polite gulls—compared to their much larger Larid relatives.

Heermann’s gull:

  • length 19 inches/48 centimeters

  • wingspan 51 inches/129 centimeters

Great black-backed gull:

  • length 30 inches/76 centimeters

  • wingspan: 65 inches/165 centimeters

Grand Central Station Valley, Isla Rasa, Mexico. Photo © Julia WhittyGrand Central Station Valley, Isla Rasa, Mexico. Photo © Julia Whitty.

In the photo above, you can see the nesting territories of the gulls dotting the island’s valleys. Gulls also nest throughout the rocky hillsides and ridgelines.

Heermann's gull. Photo © Julia Whitty.Heermann’s gull. Photo © Julia Whitty.

In fact Heermann’s gulls nest on every square inch of this sunbaked, windswept island—except where thickets of cholla cactus have taken hold… and where colonies of terns have usurped them.

Elegant tern colony in the midst of Heermann's gulls, Isa Rasa, Mexico. Photo © Julia Whitty.Elegant tern colony in the midst of Heermann’s gulls, Isa Rasa, Mexico. Photo © Julia Whitty.

In the photo above you can see how elegant terns (Thalasseus elegans) have successfully muscled into the territories of gulls in one of the island’s eleven valleys.

Elegant terns, Isla Rasa, Mexico. Photo © Julia Whitty.Elegant terns, Isla Rasa, Mexico. Photo © Julia Whitty.

The terns nest closer together than the gulls. This, and the fact that they move into gull territories en masse and often under cover of night, means they generally get what ground they want—even though they’re smaller birds.

Heermann’s gull:

  • length 19 inches/48 centimeters

  • wingspan 51 inches/129 centimeters

Elegant tern:

  • length 17 inches/43 centimeters

  • wingspan 34 inches/86 centimeters

Heermann's gulls and elegant terns, Isla Rasa, Mexico. Photo ©Julia Whitty.Heermann’s gulls and elegant terns, Isla Rasa, Mexico. Photo © Julia Whitty.

Here’s what the two species look like nesting side-by-side.

You can probably already tell from the numbers of birds in the photos that’s it’s been a very good year so far on the island.

Heermann's gull chick and eggs. Photo ©Julia Whitty.Heermann’s gull chick and eggs. Photo © Julia Whitty.

By the time I left, chicks were hatching everywhere and the whole island was transformed from the calm (in comparison) business of incubating to the furious business of feeding tiny insatiable stomachs.

In a forthcoming Mother Jones article I’ll be writing more about why this year may be the best for the Gulf’s seabirds since the mid-19th century.

DOES IT FEEL LIKE POLITICS IS AT A BREAKING POINT?

Headshot of Editor in Chief of Mother Jones, Clara Jeffery

It sure feels that way to me, and here at Mother Jones, we’ve been thinking a lot about what journalism needs to do differently, and how we can have the biggest impact.

We kept coming back to one word: corruption. Democracy and the rule of law being undermined by those with wealth and power for their own gain. So we're launching an ambitious Mother Jones Corruption Project to do deep, time-intensive reporting on systemic corruption, and asking the MoJo community to help crowdfund it.

We aim to hire, build a team, and give them the time and space needed to understand how we got here and how we might get out. We want to dig into the forces and decisions that have allowed massive conflicts of interest, influence peddling, and win-at-all-costs politics to flourish.

It's unlike anything we've done, and we have seed funding to get started, but we're looking to raise $500,000 from readers by July when we'll be making key budgeting decisions—and the more resources we have by then, the deeper we can dig. If our plan sounds good to you, please help kickstart it with a tax-deductible donation today.

Thanks for reading—whether or not you can pitch in today, or ever, I'm glad you're with us.

Signed by Clara Jeffery

Clara Jeffery, Editor-in-Chief

We Recommend

Latest

Sign up for our newsletters

Subscribe and we'll send Mother Jones straight to your inbox.

Get our award-winning magazine

Save big on a full year of investigations, ideas, and insights.

Subscribe

Support our journalism

Help Mother Jones' reporters dig deep with a tax-deductible donation.

Donate

Share your feedback: We’re planning to launch a new version of the comments section. Help us test it.