Writing and Reading

      [1] Scientists sought ways to increase the number of eggs laid and chicks hatched. [2] In the wild, whooping cranes typically lay two eggs at a time and only one clutch (group) per year. [3] In captivity at Patuxent, scientists removed eggs from the parents' nests for incubation in the lab, which encouraged re-nesting and increased the total number of eggs and chicks produced. [4] If those egg don't survive or are lost to predators, a whooping crane may lay a second or even a third clutch that year. [5] Sandhill cranes were often used to incubate the extra eggs. 

To make the paragraph most logical, sentence 4 should be placed