BUTTERFLY MIGRATION

[Trevor Boyd]

Books have been written about migration.  No one knows all the answers, but
to take a simple example, there are thousands (maybe millions) of Painted
Ladies in North Africa north of the Sahara during the winter.  In early
spring the food plant (thistles) starts to dry up and wither due to heat and
drought, so to lay their eggs they must go somewhere else.  They fly north
into Europe and lay their eggs, so Painted Ladies are found throughout
Europe during the summer.  We get them here every year in varying numbers.
Return migrations in the autumn have been noted, probably triggered by
lowering temperatures, but maybe by shortened daylight.  This pattern has
existed for thousands of years and has become instinctive behaviour.
Favourable winds obviously help northwards dispersal.  Monarchs in North
America behave similarly.

Trevor Boyd
Butterfly Conservation (Northern Ireland)

----- Original Message -----
From: "hassan" <hassan272542 at hotmail.com>
To: <leps-l at lists.yale.edu>
Sent: Monday, January 28, 2002 9:56 AM
Subject: BUTTERFLY MIGRATION


> I wrote this massage to get some information about butterflies...
>
> I want to know When do the butterflies migrate from place to another
> and where do they go?
>
> Also I want to understand Why do the butterflies migrate and How?
>
>
> I am interesting in butterflies' life and I hope that You find all the
> answers of my question.......
>
>
>                                                                GOOD
> BYE...
>
>
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