MILWAUKEE (CBS 58) -- The 17^th annual Season of Giving Blood Drive is being held at the Milwaukee County Zoo on Wednesday.

It starts at 7 a.m. and runs until 7 p.m. The zoo is offering free admission for everyone and donors also get free parking, child care and a free admission voucher for another day.

Organizers say there is a critical need for O negative donors.

To schedule an appointment, call 1-877-BE-A-HERO.

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