Sivuqaq is an 18-year-old, larger than life captive pacific walrus. By now he should be a dad but things have not worked out. This is where reproduction scientist Holley Muraco comes in. Holley is taking on the biggest challenge of her career - trying to help Sivuqaq become a parent. Yet walrus love is a mystery - even pandas have been bred more successfully than walruses. Holley hopes the clues... see more