From Pages 34

from getting too big, a fe-
mate already in the harem
will take action against any
femaies that try to mate with
the male and move into his
nesting territory, Hurly says.
“She will act aggressively
by spreading her wings in a
threatening. gesture or by
“giving off a characteristic
‘teer’ sound,’’ he says.
“Sometimes: she will chase
the. intruding female right

out of the marsh.**

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as a surprise to many animal
watchers, he adds. It has
never really been established
whether indeed females do
act aggressively, he says.

The difference between
female and male aggression
is that the female must be
more subtle in her gestures,
he says. She must not attract
attention to herself and her
nest.

Females are not always
successful at scaring away an
intruding hussy. The male
will often intervene and may
be aggressive enough to
subdue his harem mate.

Imperial Margarine

35'- Sunday, September 1, 1985 - North Shore News

The two forces work
against each other: males.tr’-
to attract as many: new. i--
males as possible and the
already established females
shoo the newcomers away,
Hurly says. ‘it makes for a
nice balance,"" he adds.

“In some cases, if the
male .is. not , aggressive. or
doesn’t. have a good ter-
ritory, and the female is very
aggressive, you may find a
monogamous couple. On the
other hand, an aggressive
male with attractive plumage
and a high-quality territory

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may be able to establish a
large number. of females in
his harem."

The niaximum harem size
seems to be about 15 fe-
males. Most harems - fall
somewhere between this ¢x-
treme and the lower extreme
of the monogamous couple,
Hurly says.

Hurly was assisted on his
proiect by Raleigh Robert-
son. Funding came from the
Naturai Sciences and
Engineering Research Coun-
cil. . ce

‘(Canadian Science News)

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