NEW YORK -- Vampy teen Monster High dolls are taking a bite out of squeaky-clean Barbie.

Mattel said Wednesday its second-quarter net income fell 24 percent, hurt by a continued slide in Barbie sales and a $14 million write-down on the toy maker's Polly Pocket line.

Its shares dropped nearly 7 percent Wednesday.

It was the fourth straight quarter of sales declines for Barbie, one of Mattel's biggest and most iconic brands, and Mattel executives said their Monster High and other girls doll lines were likely taking away some sales from the 54-year-old fashion doll.

Monster High dolls, which are based on teen characters that are offspring of famous monsters, have been a huge hit for Mattel since they were introduced in 2010. Monster High sales have likely grown to more than $500 million in just three years of existence, while Barbie annual sales are about $1.3 billion, estimates BMO Capital Markets analyst Gerrick Johnson.

Other doll lines including American Girl and Disney Princesses have been performing well too.

"We've introduced new franchises that have fueled significant category growth for the industry," said CEO Bryan Stockton "The Barbie brand is likely being modestly impacted by their successes."

But Stockton noted that Barbie was still the largest doll brand and its sales are still higher than when Monster High was introduced in 2010.

He also said Barbie sales will likely pick up in the second half of the year when shipments of new products increase in time for the holiday season – which the company dubs "the season" – and the other three quarters of the year that it calls the "preseason."

To mirror consumer fascination with all things digital, new Barbie products have taken on a distinctively techy tone: Holiday offerings include a $49.99 Barbie train and ride horse, which features an interactive horse; $69.99 Barbie Digital Makeover Mirror, which turns an iPad into an interactive mirror; and $49.99 Barbie Digital Dress Doll that features LED and touch screen technology, letting girls customize Barbie outfits digitally.

Toy industry sales have been in slight decline all year, hurt by cautious consumer spending, a video game industry slump and increased demand for electronic gadgets like smartphones and tablets. And while Mattel, the largest U.S. toymaker, usually outperforms its rivals, the latest results show it is not immune to industry-wide declines.

Stockton said the results reflect a $14 million asset impairment charge related to its Polly Pocket line as well as investments made to help the company grow in the future, investing in American Girl stores, and expanding in Russia and China.

In the April-to-June quarter, Mattel's net income dropped to $73.3 million, or 21 cents per share. That compares with $96.2 million, or 28 cents per share, a year ago.

Mattel didn't specify what it earned excluding unusual items. Analysts expected earnings of 32 cents per share but typically exclude unusual items from the estimates.

Revenue for the El Segundo, Calif., company edged up to $1.17 billion from $1.16 billion as international sales grew. Still, this missed Wall Street's estimate of $1.22 billion.

North American sales fell 2 percent, while International sales rose 4 percent.

Sales of Mattel's Barbie franchise declined 12 percent in the latest quarter. Sales of the company's other girls brands climbed 23 percent, mostly due to the continued popularity of Monster High products.

One bright spot was Mattel's American Girl line, with sales up 14 percent. Sales of Fisher-Price branded products dropped 3 percent, while Hot Wheels sales dipped 1 percent.

Mattel Inc. said Wednesday that its board declared a third-quarter dividend of 36 cents. The dividend will be paid on Sept. 20 to shareholders of record on Aug. 28.

Mattel shares dropped $3.17, or 6.8 percent, to close at $43.16 Wednesday. They are 11 percent below their high of $48.48 set in mid-May. They traded as low as $33.84 last July.

A more complete picture of how the toy industry is doing will come when Mattel's smaller rival, Hasbro Inc., reports on July 22.

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  • Silly Bandz

    <b>The Fad:</b> These shape-shifting silicon wristbands rose rapidly to popularity in 2010. Creator Robert Croak noted that his business grew tenfold within six months, as the company's shipments to retailers skyrocketed from <a href="http://www.cbsnews.com/2100-18563_162-6481251.html" target="_hplink">20 boxes a week to 1,500</a>. That's millions of bracelets a week. <b>Made By:</b> BCP Imports (Toledo, Ohio)

  • Snuggie

    <b>The Fad:</b> When it was introduced in 2008, the Snuggie -- a blanket with sleeves -- <a href="http://www.nytimes.com/2010/12/22/business/media/22adco.html/" target="_hplink">endured ridicule</a> from Jay Leno, Ellen Degeneres and the YouTube community at large. But for the Snuggie, no press was bad press, and the product took off during the 2008 holiday season. By the end of 2010, <a href="http://abclocal.go.com/wabc/story?section=news/consumer&id=7860301" target="_hplink">25 million Snuggies had been sold</a>, one for about every 12 residents of the United States. <b>Made By:</b> Allstar Products Group (Hawthorne, NY)

  • Gogo's Crazy Bones

    <b>The Fad:</b> These mini figurines and the game that accompanies them enjoyed a surge in sales in the late 1990s. Between 1998-2000 over <a href="http://www.kidsturncentral.com/topics/toys/tn021209c.htm" target="_hplink">31.5 million packages</a> of the toys were sold. Another 23 million figurines were sold in the UK and Spain after a relaunch in March 2008. <b>Made By:</b> Catalan company Magic Box Int, part of Martomagic

  • Homies

    <b>The Fad:</b> These collectible 2-inch figurines commonly sold in vending machines have seen years of success, despite <a href="http://articles.latimes.com/1999/may/24/news/mn-40448" target="_hplink">some saying that they promote negative cultural stereotypes</a>. To date, <a href="http://www.homiesphonecards.com/About.html" target="_hplink">over 120 million Homies have been sold</a>. <b>Made By:</b> Artist David Gonzalez

  • Koosh Balls

    <b>The Fad:</b> After its introduction in 1987, Scott Stillinger's rubberband ball hybrid became a must-have hit during the 1988 holiday season. After moving 50 million Koosh balls, <a href="http://money.ca.msn.com/savings-debt/gallery/gallery.aspx?cp-documentid=23389935&page=2" target="_hplink">Stillinger sold his company OddzOn to Russ Berrie and Company Inc.</a>, which eventually sold for more than $100 million units in 1997. Toy manufacturer Hasbro now handles Koosh ball production. <b>Made By:</b> OddzOn Products, Inc. (Napa, California)

  • Furby

    <b>The Fad:</b> During the 1998 holiday season, the Furby -- the endearing, yet creepy talking furry friend -- was selling out everywhere. Riding its popularity through the late '90s, 40 million Furbies would end up in homes around the world. Hasbro is currently planning a <a href="http://abcnews.go.com/Technology/furby-makes-high-tech-comeback/story?id=16743565#.UDKvkNBSTDU" target="_hplink">high-tech comeback for the Furby</a> later this year. <b>Made By:</b> Tiger Electronics (Vernon Hills, Illinois) before being taken over by Hasboro

  • Tamagotchi

    <b>The Fad:</b> Japanese designers <a href="http://www.inquirelive.co.uk/node/4042" target="_hplink">released the Tamagotchi in 1996</a>. The egg-shaped handheld device and keychain let owners feed and care for a digital pet. The simple, addictive game would eventually gain popularity with American kids. More than <a href="http://www.wired.com/wiredscience/2010/03/tamagotchi-health/" target="_hplink">70 million Tamagotchi's</a> have been sold worldwide. <b>Made By:</b> Akihiro Yokoi of WiZ and Aki Maita of Bandai (Japan)

  • Slap Wraps Slap Bracelets

    <b>The Fad:</b> Between <a href="http://www.nytimes.com/1990/10/30/us/us-consumer-panel-warns-of-injury-by-slap-bracelets.html?pagewanted=all" target="_hplink">controversy that labeled it a weapon</a> and its popularity as a fashion item, Slap Wrap bracelets were everywhere in the '90s. In its first year of release in 1990, the <a href="http://www.nytimes.com/1990/10/27/business/turning-profits-hand-over-wrist.html?pagewanted=all&src=pm" target="_hplink">Slap Wrap would bring in $15 million</a> -- $26 million in today's dollars -- in revenue. They're still seen in stores everywhere, with companies producing knock-offs and imitations. <b>Made By:</b> Stuart Anders and Main Street Toy Company (Franklin, Tennessee)

  • Chia Pets

    <b>The Fad:</b> <em><a href="http://www.youtube.com/watch?v=3_zwx6OXjMc&feature=player_embedded" target="_hplink">Chi-chi-chi-chia!</a></em> More than just a catchy jingle, the Chia Pet craze began in 1977. The clay figures are coated with seeds of a Mexican herb that when watered sprout green fur. <a href="http://www.smithsonianmag.com/arts-culture/object-chiapet-200712.html" target="_hplink">Up to 500,000 Chia "pets" are sold every single year.</a> <b>Made By:</b> Joseph Enterprises (San Francisco)

  • Baby On Board Bumper Stickers

    <b>The Fad:</b> Inspired by a terrifying car ride Michael Lerner had in Boston with his 18-month-old nephew in 1984, "Baby On Board" bumper stickers began selling <a href="http://online.wsj.com/article/SB10001424052748703916004576271282489578512.html" target="_hplink">500,000 stickers per month</a> within the product's first nine months, and brought deals with Toys 'R' Us, Wal-Mart and Kmart. By 1999, with sales at $158 million, Lerner would eventually sell the Safety 1st company. <b>Made By:</b> Michael Lerner and Safety 1st (Boston), acquired by Canadian company Dorel Industries Inc. in June 2000

  • Rubik's Cube

    <b>The Fad:</b> Invented by Hungarian professor Erno Rubik in 1974, the brain-twisting toy known as the Rubik's Cube has endured as an immensely popular product. Considered by some to be the <a href="http://www.independent.co.uk/news/science/rubiks-cube-25-years-on-crazy-toys-crazy-times-461768.html" target="_hplink">best selling toy of all time</a>, it is estimated that as of January 2009, <a href="http://www.rubiks.com/i/company/media_library/pdf/Rubiks Fast Cube Facts February 2010.pdf" target="_hplink">350 million Rubik's Cubes had been sold worldwide</a>. <b>Made By:</b> Erno Rubik, sold to Ideal Toy Company in 1980