While searching for an address for the president, Ms Marjorie Kaplan, I found this news item - Ms Holland looks like the responsible party.

Animal Planet Media Names Whitney Holland Vice President of Program Planning and Scheduling

-- Television Veteran Brings Vision and Expertise to Animal Planet’s
Line-up --

September 16, 2008

(New York, N.Y.) Rick Holzman, senior vice president of programming and scheduling for Animal Planet Media, named television veteran Whitney Holland to the position of vice president of program planning and scheduling for Animal Planet. Based in New York and reporting to Holzman, Holland is in charge of optimizing the network's current programming lineup and steering long-term development needs.  
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and here's their snail mail address:

Animal Planet Media Enterprises

One Discovery Place

Silver Spring, Maryland 20910-3354