Misc: What vitamin found in carrots is good for the eyes?

Questions

---------- swim in circles while they sleep with the eye on the outside of the circle open to keep watch for predators. After a certain amount of time, they reverse and swim in the opposite direction with the opposite eye open.?

An ---------- may weigh as much as 300 pounds. Its intestinal tract is 45 feet long.?

Domesticated ---------- (farm-raised) cannot fly. Wild ---------- can fly for short distances at up to 55 miles per hour. Wild ---------- are also fast on the ground, running at speeds of up to 30 miles per hour.?

An ostrich's eye is bigger than its ----------?

Ducks will lay eggs only in the ----------?