In order to return to the same nest or loft, they must also be able to recognize familiar landmarks. Furthermore, researchers have found that birds are much more sensitive than humans to sounds and smells ​ — although they don’t know to what extent this ability is used for navigation.
हालाँकि ये सब अनुसंधान यह स्थापित करने में सहायक रहे हैं कि पक्षी एक निश्‍चित दिशा में कैसे उड़ सकते हैं, फिर भी एक उलझानेवाली समस्या बनी रहती है ।