Service areas

Empty heading

Residential resources

Business resources 

  • Carlsbad Green Business Program - FREE
    • Join our statewide network of like-minded businesses and save money and resources! The Carlsbad Green Business Program helps businesses implement sustainable practices, all while enhancing their bottom line. Our Program representatives facilitate the process from start to finish, making going “green” as straightforward as possible. Certified businesses receive City Council recognition and also have access to up to $250 in rebates for purchases made to meet certification measures. To get started in your free certification, go to greenbusinessca.org/cityofcarlsbad and select “Get Certified!
Environmental guiding principles
Sustainability guiding principles

California least tern spotlight

Post Date:08/22/2024 9:32 AM

Species spotlight on the endangered California least tern
If you’ve spent time near Carlsbad’s lagoons or coastal beaches, you might have been lucky enough to catch a glimpse of one of our more delicate local residents—the California least tern (Sternula antillarum browni).



Despite its name—the “least” just means it’s the smallest of the tern species—this little bird plays a big role in our local environment.

  • The California least tern is an endangered species and was one of the first to receive federal protections after the Endangered Species Act passed in 1973.
  • These seabirds are seasonal visitors to Carlsbad, typically nesting along our coast from mid April to September.
  • They have black “caps” on the tops of their heads, white foreheads, and sharp, pointed bills.
  • Their call is a high-pitched, rapid “kit-kit-kit” that often alerts you to their presence before you see them. (You can hear their call online.)
  • Least terns tend to form monogamous pairs, with both males and females working together to defend their nest by diving at intruders.

The California least tern prefers the sandy, open spaces near our lagoons and beaches, so if you’re walking by these areas, keep an eye out for their quick, darting flights or listen for their characteristic call.

What the California least turn is telling us
The California least tern’s presence in Carlsbad is a sign that our local environment is in good shape because they rely on a healthy coastal and lagoon habitats to survive.

If these terns are present, it indicates that the environment supports what they need to thrive, including sandy nesting sites, clean water and abundant food sources like small fish and invertebrates.

The California least tern also helps control populations of small fish and insects, which supports the overall health of our beaches and lagoons.

Protecting the California least tern
The city’s Habitat Management Plan, developed in partnership with federal and state wildlife agencies and experts, is designed to preserve and protect sensitive plant and animal species like the endangered California least tern.

This plan is part of a regional effort to create a connected system of open space lands. With over 6,200 acres of open space, our citywide preserve system links to other preserves outside the city, giving species like the least tern room to thrive.

Return to full list >>