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Saving time-lapse close up of Monarch caterpillar pupating and later the butterfly braking out of its chrysalis. Notice how the wings expand as the belly fluids are pumped into them. Save a Monarch, grow a Milkweed!

(CBS) Every spring, blue skies in Michoacán, Mexico, turn orange. For centuries, millions of monarchs have gathered in these same ancient forests, traveling from as far away as Maine, North Dakota, and even Canada. They weigh just a fifth of a penny, but so many flapping wings can sound like falling rain.

There are an estimated 250 million monarchs that winter in this preserve. That sounds like a lot - and it certainly looks like a lot, but imagine 15 years ago when there were nearly one billion. The problem is giant fir trees where monarchs huddle for warmth are being cut down.

Without cover, millions of butterflies often freeze to death - in an average year, up to 15 percent. But this year, bad weather killed more than 50 percent.

Right now, we're inside a protected area of about 140,000 acres that the Mexican government set aside as a preserve for the monarch butterflies. Still, inside this zone, every year, more than 100,000 trees are cut down.

Mexico recently lost nearly 7 percent of its forests, an area twice the size of New Jersey, much of it from illegal logging. Deforestation threatens more than butterflies, as it destroys watersheds which can cause mudslides. One five miles from a butterfly sanctuary killed 17 people.

A 14-year-old New Zealand girl, Lydia Ward, and her father Tim spoke to Maggie Rodriguez about how she used her boogie board to survive a shark attack.

"CBS News RAW": daytime pictures of the aftermath of the Tuesday's earthquake in Haiti. There were crying victims among the downed buildings.

A former writer for David Letterman said she quit his NBC talk show in part because of alleged sexual favoritism and a hostile work environment.Nell Scovell, writing for Vanity Fair online Tuesday, said she had no intention of filing a lawsuit and wasn't seeking revenge.Scovell, who went on to a successful Hollywood career, said in a telephone interview.In the Vanity Fair article, Scovell said Letterman didn't "hit on her" during her roughly five-month stint with NBC's "Late Night with David Letterman" in 1990.Other high-level male employees were having sexual relationships with female staffers as well, she alleges, and the women gained professional benefits from those relationships.CBS News producer Robert J. "Joe" Halderman has pleaded not guilty to trying to extort $2 million from Letterman to keep some of the comedian's sexual affairs quiet. Scovell wrote she doesn't intend to seek legal action.Instead, she said, she wants to call attention to the complete lack of women writers on all talk shows, whether hosted by Letterman or NBC's Jay Leno and Conan O'Brien.She quit Letterman's NBC show, Scovell wrote, because she saw "I was not going to thrive professionally in that workplace. And although there were various reasons for that, sexual politics did play a major part."When Letterman asked why she was leaving the New York-based show, she says she considered telling him the truth but balked because his "rumored mistress" was within earshot. Instead, Scovell writes, she told him she missed Los Angeles.