How Starbucks Found Its Mythical Mermaid

Starbucks was founded in Seattle in 1971 by three friends inspired by the novel Moby Dick. They named their company after the first mate, Starbuck, and created a logo featuring a two-tailed siren. The logo, initially brown, was later changed to green to symbolize freshness. Over the years, the siren's design evolved, including a redesign in 2011 that added asymmetry to make her appear more human. Today, Starbucks is a global brand with a presence in 76 countries and a brand value exceeding $8.7 billion.

How did the design of the siren change in response to public feedback?

What is the estimated brand value of Starbucks as mentioned in the text?