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Why Do Geese Fly in Formation?


You hear a distant call in the sky, "Honk! Honk!" You look up and see a V-shaped formation of geese passing overhead and going south.

Taken From http://cerdasforlife.blogspot.com/2012/01/filosofi-angsa.html


That V-shaped formation of geese actually goes at the express train speed of about 50 miles an hour. We can make a guess as to why they fly in this formation. We know that airplanes fly in this formation, too, so that each planes can see the other and follow a leader. The geese also follow a leader on their flights, a wise old gander which knows the way perfectly, day or night. The V-formation is as good as for them as it is for planes.

Altogether, there are approximately 40 differrent species of geese. Only 10 or 12 are found in the United States, and practically all of these are only winter visitor. The goose might be considered a Canadian bird.

The best known of these geese is actually called the "Canadian goose" It flies over nearly all of North America while migrating. Its head and neck are black with a broad white patch extending across its throat and sometimes up across both cheeks.

The canada goose usually keeps the same mate for a lifetime. Its favorite food in spring and summer are grasshoppers, but it also eats other inscets and earthworms. Much of time, however, it feeds on wild plants, wild rice, the roots of rushes. It builds its nest on the ground, as do other geese, and lines the nest with down from its own breast.

The Canada goose is delicious to eat, and until laws here were passed to protect it, thousands were killed every year. A grown goose weighs about 12 to 14 pounds.

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Honk!....Honk!... Begitulah bunyinya jika suatu hari kamu melihat ke langit saat musim dingin segerombol angsa membentuk formasi V terbang ke selatan.

Formasi V pada angsa ini sebenarnya bergerak 50 mil perjam (setara 81 km/jam) secepat kereta api express. Mungkin kita bertanya-tanya mengapa angsa-angsa ini terbang dengan formasi demikian. Seperti yang kita tahu pesawat terbang membentuk formasi seperti ini juga sehingga pesawat lain mampu melihat dan mengawasi satu sama lain sekaligus mengikuti pesawat terdepan. Angsa ini juga mengikuti angsa terdepan (leader) selama perjalanan. Biasanya angsa yang memimpin adalah angsa jantan yang mampu melihat dengan jelas arah tujuan baik waktu siang maupun malam. Formasi angsa seperti ini sama menguntungkannya bagi para pilot dalam formasi pesawat.

Pada waktu yang bersamaan, kurang lebih terdapat 40 spesies angsa yang berbeda-beda bermigrasi. 10 atau 12 jenis angsa dapat dijumpai di Amerika hanya pada saat musim dingin. Angsa-angsa tersebut tergolong dalam kategori burung Kanada dan lebih populer dikenal sebagai "Angsa Kanada".

Selama bermigrasi angsa-angsa ini terbang melewati hampir semua bagian Amerika Utara. Kepala dan lehernya biasanya berwarna hitam dengan warna putih di bagian pipi.

Angsa Kanada biasanya hanya memiliki satu pasangan seumur hidup. Makanan kesukaannya saat musim semi dan musim panas adalah belalang, selain itu mereka juga makan serangga atau cacing. Angsa ini biasanya menghabiskan waktu memakan tanaman liar, padi liar, atau akar semak-semak. Mereka membuat sarang di daratan dengan bulu-bulu halus dari dadanya.

Angsa Kanada biasanya lezat dikonsumsi, sampai undang-undang perlindungan angsa diberlakukan ribuan angsa diburu setiap tahunnya. Seekor angsa biasanya memiliki berat badan 12 sampai 14 pound (kurang lebih 6 kg)

Source: Book entitled "Tell Me Why ?" by Arkaedy Leokum

Translated: Cahya Ferry Kusuma

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