func FlyAway(canfly Creatures) string {
	if canfly.Fly() == true {
		return fmt.Sprintf("%s's can Fly - flap flap flap", canfly.Kind())
	}
	return fmt.Sprintf("%s's can't Fly", canfly.Kind())
}
FlyAway - I only know about Creatures
package laboratory
import "fmt"
type Creatures interface {
	Kind() string
	Fly() bool
	Sound() string
}
func Greet(c Creatures) string {
	return c.Sound()
}