In the mountainous regions of
Africa, between 8,000 and 12,000 feet above sea level, mountain gorillas
rule the trees. With approximately 700 mountain gorillas remaining as human
encroach on their natural habitat, humans have to learn to live with these
large, long-armed, intelligent creatures. Not often poached for meat or
commercial products, they often die defending their territory. Many
gorillas simply move deeper into the mountains, where they suffer from the
harsh climate.
Larger than lowland gorillas,
mountain gorillas have thicker fur to withstand temperatures that drop
below freezing. While they can climb trees, they also tend to roam through
a ground territory up to 15 square miles and live on an omnivorous diet.
Gorillas live in communities of up to 30 extended family members. These
primates are highly social, and some have been able to learn simple human
sign language.
At around 5 feet tall when standing
and weighing around 400 pounds, both male and female gorillas are naturally
striking. The groups are led by an older dominant male, often called a
silverback gorilla because of his usually graying fur. Challengers to his
rule will experience an impressive display of strength and power—pounding
his chest, roaring, intimidating them with physical prowess by throwing
objects. However, gorillas do not tend to be aggressive unless threatened.
Mothers are pregnant with their babies for about 9 months, carry them in
their arms or on their backs for the first four to five months of life, and
care for their small young until they are over a year old.
The largest animal ever known to have lived, blue whales have been
recorded at over 100 feet long. Although an estimated 10,000 remain,
these giants are considered endangered because of their extensive
history with poaching. In the late 19th century with the invention of
the harpoon cannon, blue whales became highly sought-after for their
blubber and were hunted extensively until the 1960s. Their population
numbers were likely reduced by as much as 60%. Since conservation
efforts began and the animals became protected, their population has
contended with new threats to their ecosystems and food sources.
While they appear a true blue under water, the blue whale’s skin
has a heavy grey undertone. Microorganisms live on their skin, causing
their stomachs to take on a yellow tone. Inhabiting every ocean in the
world, blue whales often migrate with the seasons to remain in warmer
climates. These creatures live as long as a century, which is measured
by counting the layers of build-up in their ear canals, like counting
the rings on a tree. They live on krill, a tiny shrimp-like organism.
By sucking water into their mouths and then pushing it out again
through pleated structures called baleen, blue whales filter the
organisms out of the water. An adult blue whale can eat as much as 4
tons of krill every day.
Blue whales are born large—up to 25 feet and 3 tons—and grow
quickly. A mother whale produces 50 gallons of milk every day that is
as much as 50% milk fat, allowing their babies to gain about 200 pounds
per day for their first year of life. Blue whales are known to live in
family units for the first year and then often pair off or live in
small groups, cruising the oceans at an average of 5 miles per hour
(but as fast as 20 miles per hour). With an extensive series of calls,
whistles, and moans, some scientists believe that blue whales can hear one
another’s signals nearly 1,000 miles away.
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