Does the Graph Say
About Food at the Overwintering Sites?
are the highest in November. This is the month when monarchs arrive
at the overwintering sites in Mexico.
fall in November, December, January, February and March. These
are the months that the monarchs spend in Mexico.
out of fat is a common cause of death in Mexico, says Dr. Bill Calvert.
"Monarchs that you see littering the ground have usually starved
the monarchs arrive in Mexico in November they must have enough
fat in reserve to survive the winter. Their winter habitat does
not have enough food (flowers with nectar) to feed the millions
of monarchs that overwinter there.
the monarch's winter habitat does meet the monarchs needs in a unique
way. Its cool temperatures allow the monarchs to save energy.
Monarch butterflies are cold blooded. When temperatures are cool
they burn energy (metabolize) slowly.
place and conditions where all of an organism’s needs
for life are met.
water, shelter and space are key components of an organism’s
your weight were to fall at the same rates as the monarchs do
between November and April, how much would you weigh today?
A monarch tag weighs 10 mg. How many times that weight does the
average monarch lose by the end of the overwintering season?
it is true that monarchs do not eat while they are in Mexico,
then when and where DID they get the food energy that they are
Food for Five Months! But How Do Scientists Know?
Scientists say that the monarchs can survive the winter while eating little
or no food at all. Yet no scientist has ever
watched a butterfly for the full overwintering season. Follow
the links below for further reading. As you read:
- Ask yourself,
"How do scientists know?"
- Look for
the evidence that supports this amazing hypothesis.
- Also look
for holes in the hypothesis!
Important in the Monarch's Overwintering Habitat?