Hibernation
Butterfly species adopt different hibernation patterns during their life cycle.
Butterflies named ‘Banded Hair Freak’ hibernate in the form of an .
A species called ‘Dapple White’ accumulates from larval stage.
Slow metabolism can help them to sort out some problems in winter.
A substance is produced in the blood which may function as .
There are few predators because they can only survive in weather.
Migration
Monarch butterflies move to in winter.
To avoid cold temperature, they migrate to the south in large groups.
The survival skill can help them last for up to during a long journey.
Monarch butterflies fly in daytime and stay in during night.
Researchers found out that they orient by flying along the .
They also follow the direction of the for navigational aid.
During migration, they mainly feed on flowers and cannot reproduce.
Recently the annual arrival of the monarchs can be a good interest to in the region.
GIẢI THÍCH CÂU 1
Mình cần nghe xem loài 'Banded Hair Freak' ngủ đông trong form nào
=> Biết đáp án sắp tới khi nghe "Various butterfly species have formed different patterns of hibernation"
Sau đó nghe được "For example, the ‘Banded Hair Freak’ hardly hibernates in its full grown adult form, but as an egg."
=> Nó hiếm khi ngủ đông ở dạng trưởng thành mà ngủ đông ở dạng trứng
=> Đáp án: egg 
Lưu ý
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