Frog
Increase
 
Switzerland
has
reversed
 
the
decline
 
of
 
more
 
than
half
 
 
of
endangered
frogs,
toads
 
and
newts
 
in
one
region.
After
conservationists
dug
hundreds
 
of
new
ponds
 
in the canton of Aargau,
amphibian numbers
significantly increased.
 
The
European
tree frog population
especially increased
 
scientists
say.
Scientists
hope
 
this
method
 
could
 
be
used
globally
 
 
as
pond
building
 
is
simple
 
and
effective.