Tinder meets tremors as Western tarantulas look for love

Males will travel in numbers, dance hypnotically and get eaten during their annual hunt to mate.

 

Tarantula sightings have seemed high this year compared with previous mating seasons, said an expert.

This story is published with the Guardian as part of their two-year series, This Land is Your Land, examining the threats facing America’s public lands, with support from the Society of Environmental Journalists

Gaggles of tarantulas are emerging from their burrows across the Western U.S. on a quest to mate, hunting for love in prairies, foothills and a garage belonging to Kim Kardashian West.

From August to October, the eight-legged crawlers go on a walkabout for a once-in-a-lifetime foray to find a partner. The phenomenon is now occurring on a unusually large scale from northern California to Colorado and Texas, shining a light on the arachnids’ remarkable mating behavior, which can involve dancing and cannibalism.

For the first five to eight years of their lives, males live in a burrow, eating insects and maybe a mouse or snake. Tarantulas are wait-and-see predators; it’s quite a solitary life. “Then one day, they just pick up and leave in search of a willing female,” said Ana Cholo, a National Park Service public affairs officer who keeps a tarantula as a pet.

Male tarantulas aren’t mature until they reach age five, or eight, or 10 –depending on the species, said Forest Urban, manager of the invertebrate program with the Natural History Museum of Los Angeles. “Typically in all of spiderdom, males are much smaller and don’t live very long at all compared to females,” he said, which can make it to age 30. One reason for the size differential is that it takes a great deal of metabolic energy for females to produce and carry eggs, far more than it costs males to produce sperm.

Each year, starting in the late summer, it’s a guys week out, if you will. “Ding dong, it’s time,” said Urban. “All of a sudden, the eight-to-12-year-olds, they’re like, ‘Hey, let’s get together, let’s go to the bar.’ ”

Both sexes are blind – they can only detect light and dark – so this foray across the open range each evening is filled with danger. That’s one reason they team up. Predators like birds or tarantula hawk wasps are likely to only grab a few meaty tarantulas as snacks, and the rest can continue on their mission.

Because they spend most of their lives underground, tarantulas don’t have many defenses, but they can bite or flick hair from their abdomens on to predators, causing itching and burning. When they’re out in the world, it’s a numbers game. The more they stick together, the more likely it is that one of the crew is going to score.

Because they spend most of their lives underground, tarantulas don’t have many defenses.

Urban sounded mind-boggled by the difficulties they face, “without a map, blind, at night, for miles, and you only have a certain number of days to do this before you’re going to die.”

To find a female in a burrow about a foot underground, the male tries to detect vibrations. If he somehow succeeds, he’ll tiptoe in or knock on the web covering her burrow. His genitalia – known as a pedipalps – are right by his face, like two boxing gloves. “They use this glove-like apparatus to dispel sperm, and then it deflates like a balloon,” says Urban. After laying down a layer of sperm over silk web, the male heads for the hills – because if he lingers, the female will usually eat him.

Different species of tarantulas have developed ways of managing the fraught moment when the male encounters the female. “Some do a dance to try to hypnotize the female so she doesn’t strike,” Urban explains. “Others will drum their pedipalps to create a beat. Some will literally do a dance routine that looks like the YMCA.” As for the female? “She’ll just sit there like, uh, really dude? And more times than not, he gets eaten.”

Her hunger sated, the female will deposit her eggs on the sperm mat and bundle it up into a waterproof cocoon. Around three months later, she will have up to 1,000 spiderlings.

Even if the male isn’t gobbled up, his days are numbered. Males typically die within six months of mating.

For a female, making eggs is so energy-intensive that once she makes her cocoon, she won’t be able to do it again for another three years.

Tarantula sightings have seemed high this year compared with previous mating seasons, said Urban. Kim Kardashian West, who lives in Calabasas, California, posted photos to Instagram of three tarantulas she found in her garage. “It’s mating season,” she observed. Kardashian has been terrified by tarantulas on a previous occasion.

Even if they’re jolting to see, whether from excitement or fear, experts don’t recommend picking one up – not because they will hurt people but because tarantulas have a thin exoskeleton and can be injured if they fall.

Of course, that’s nothing compared with being consumed after sex.

Katharine Gammon is a freelance science writer based in Santa Monica, California. Email High Country News at [email protected] or submit a letter to the editor

High Country News Classifieds
  • OPERATIONS AND FINANCE MANAGER
    Great Old Broads for Wilderness, a national grassroots organization led by women, seeks a resourceful, self-motivated, team player to serve as Operations and Finance Manager....
  • EXECUTIVE DIRECTOR
    ORGANIZATIONAL BACKGROUND Colorado Canyons Association (CCA) fosters community stewardship, education and awareness of our National Conservation Lands with a focus on Dominguez-Escalante, Gunnison Gorge and...
  • WYOMING STATE DIRECTOR
    Save the World ... or at least a piece of it! Join The Nature Conservancy and make a tangible and lasting impact by creating a...
  • PROGRAM DIRECTOR FOR AN ENVIRONMENTAL ADVOCACY NON-PROFIT NEAR YOSEMITE
    Demanding, but rewarding, advocacy work on forest, water, wildland, and wildlife issues. Applicants should have experience dealing with land management planning, public speaking, grassroots organizing,...
  • NEW AGRARIAN APPRENTICESHIP
    Quivira Coalition's 2020 New Agrarian Apprenticeships in Regenerative Ranching and Farming -Apprenticeships run 4/20 - 11/20 Applications accepted 10/15/19 - 12/1/19 NAP partners with skilled...
  • PHILANTHROPY DIRECTOR AT WILDERNESS WORKSHOP
    Wilderness Workshop seeks a full time Philanthropy Director to raise funds for our team. Learn more: www.wildernessworkshop.org
  • EXECUTIVE ASSISTANT WITH WESTERN RESOURCE ADVOCATES
    Western Resource Advocates (WRA) seeks an enthusiastic and organized problem solver to join our growing team as an Executive Assistant. The Executive Assistant is instrumental...
  • WYOMING OUTDOOR COUNCIL
    Two positions: Development Director OR Development Writer, Communications Director. Full job descriptions at https://wyomingoutdoorcouncil.org/careers.
  • CONSERVATION PROJECT MANAGER
    Great Land Trust seeks to hire a Conservation Project Manager. Position is full-time, based in Anchorage, Alaska. First review of applications will be on October...
  • EXECUTIVE DIRECTOR
    Eagle Valley Land Trust Executive Director Position Description Summary of Position: The Executive Director, working with and reporting to the Board of Directors, has overall...
  • FINANCE & LOGISTICS COORDINATOR
    The Rocky Mountain Biological Laboratory, founded in 1928 as an independent nonprofit organization, is a biological field station located near Crested Butte, Colorado. Our primary...
  • DEVELOPMENT DIRECTOR
    See Full Job Description
  • DEVELOPMENT COORDINATOR
    Position: Development Coordinator Responsible to: Executive Director Time Commitment: 15-20 hours per week, or as otherwise agreed upon General Description: The Development Coordinator assists the...
  • EDUCATION CENTER MANAGER
    Friends of Cedar Mesa seeks a full-time Education Manager for the Bears Ears Education Center to provide day to day operational and administrative oversight. See...
  • TROUT UNLIMITED SCP SOUTHWEST REGIONAL DIRECTOR
    Seeking to hire an experienced advocate/manager to oversee the organization's sportsmen/women-driven advocacy in Colorado, New Mexico and Arizona. Open until filled
  • PROGRAM MANAGER
    for northern AZ collaborative conservation ranchlands group
  • EXECUTIVE DIRECTOR
    Partners are seeking an experienced and energetic Executive Director who is excited about the opportunity to lead our growing organization! A full description of the...
  • EXECUTIVE DIRECTOR
    High Country News Seeks an Executive Director to advance its mission, grow its audience and influence, and strategically and sustainably guide the organization through a...
  • 2 PROPERTIES ON THE WESTERN EDGE OF THE GILA WILDERNESS
    Organic farm, hot springs, San Francisco River runs through both. [email protected]
  • CHUCK BURR'S CULTUREQUAKE.COM BLOG
    Change will happen when we see a new way of living. Thinking to save the world.