May 13, 2008
Seal Tries Sex with Penguin
A seal has been caught on camera trying to have sex with a penguin.
This seems to be the first known example of a sexual escapade
between a mammal and another kind of vertebrate such as a bird, reptile
or fish, "although some mammals are known to have attempted sexual
relief with inanimate - including dead things - objects," said
researcher Nico de Bruyn, a mammal ecologist at the University of
Pretoria in South Africa.
One summer morning, scientists observing elephant seals on a beach
on Marion Island near the Antarctic spotted a young male Antarctic fur
seal subduing a king penguin.
"At first we thought it was hunting the penguin, but then it became
clear that his intentions were rather more amorous," de Bruyn recalled
today via email.
The roughly 240-pound seal subdued the 30-pound adult penguin by
lying on it. The hapless bird of unknown sex struggled, rapidly
flapping its flippers and attempting to stand and flee, without luck.
The seal then alternated between resting on the penguin and
thrusting its pelvis at the bird in vain attempts to insert its penis
for 45 minutes. Natural, unsuccessful sexual escapades by this variety
of seal with members of its own species may last as long as this
penguin assault did, "but yes, it is quite a long time and thus
unusual," de Bruyn told LiveScience.
The seal then abruptly gave up, moving to sea and completely
ignoring the target of its affections. The penguin apparently did not
suffer any injury. The scientists detailed their findings in the May
issue of the Journal of Ethology.
Sexual harassment is common in the animal kingdom - "Homo sapiens are often testimony to that," de Bruyn said.
Many species perform some form of sexual harassment on members of
their own species, "for a variety of reasons many of which are hotly
debated," he added.
Many species of seal are polygynous, where one male mates with many females. The males often fight each other to control females.
"This system thus promotes extreme aggression in males towards each
other, and if a male cannot control a beach, this aggression may spill
over to sexual aggression directed at outlying females, pups or even in
rare cases other seal species," de Bruyn said.
And this sexual aggression apparently might leap well beyond the species gap.
The Antarctic fur seals of Marion Island are the only ones known
that eat king penguins. The thrill of the hunt felt by the seal the
researchers saw may have channeled into its sex drive, as the mating
season had just come to an end.
"It may have wanted to eat it and half-way through the chase changed
its mind," de Bruyn speculated. "I personally believe the link between
aggressive and sexual behavior is evolutionarily far closer linked than
we currently believe. This has obvious implications for humans."
On the other hand, the amorous seal may simply have been sexually inexperienced and playful, and wanted practice, the researchers conjectured.
"There are many things that we do not understand about ourselves
that are mirrored in other species," de Bruyn said. "Thus by continuing
with research efforts on other vertebrates we could learn a great deal
about the whys behind human behaviors."