AS AN OBSERVER of the North American porcupine for more than 30
years, Uldis Roze has no idea how many times he has heard this joke.
How do porcupines reproduce? Very carefully.
That answer is “correct, but not very enlightening,” says Roze,
a professor emeritus of biology at New York’s Queens College. In
reality, the mating ritual of the quill-covered Erethizon dorsatum
is quite elaborate, protracted, and ... damp.
The species’ annual mating season is in early fall. In her chosen
tree, the female signals she’s about ready to breed by secreting an
odoriferous substance. Males drawn by the smell fight each other
in the tree branches and on the ground below her. The one not
knocked out wins mating rights—but the seduction’s not done.
To induce estrus in the female, the male squirts her with urine, a
few drops at a time. The urine is “propelled at such high velocity,”
Roze says, “that even if a male and female are sitting on separate
branches in a tree, his urine can reach her.” The male keeps it
up—“repeated salvos over many hours,” Roze says—until the female
is in the mood. Typically, the two then descend the tree to breed.
Quills could make mounting the female a prickly proposition.
But when she’s ready, the female curves her tail over her spiky
back so her tail’s quill-free underside is facing up, Roze says. The
male then can rest his paws on that surface while doing the deed.
Approximately seven months later, the female will give birth—in
this species, usually a single offspring. Known as a porcupette, the
baby is born with all its quills but also wrapped in the amniotic sac
that smooths the little one’s arrival. —PATRICIA EDMONDSMAKING
PORCUPINE
BABIES TAKES
ALL MANNER
OF MOVES
PHOTOGRAPH BY
JOEL SARTOREBASIC INSTINCTS (^) | EXPLORE
THIS FEMALE NORTH AMERICAN PORCUPINE WAS PHOTOGRAPHED AT THE GREAT PLAINS ZOO, SIOUX FALLS, SOUTH DAKOTA.