A huge number, 150,000, of Adélie penguins have disappeared from Antarctica's Commonwealth Bay. A recent study tied the occurrence to a giant iceberg that grounded in the area, isolating the penguins and causing them to starve to death. But critics are challenging that claim, suggesting that the birds relocated, instead.
Hydroelectric dams planned for the tropical rivers of Mekong, Amazon and Congo could destroy local fish habitats and cause human populations to relocate, too. A team of researchers suggest new ways to evaluate the cost and benefits of these massive structures.
Cheetahs migrated to Africa from North America 100,000 years ago during the last Ice Age. Following their "big move," populations dwindled and incestuous breeding increased. This troubled linage has had a lasting impact on modern Cheetahs, many of which have difficulty reproducing due to a gene mutation that affects sperm development.
Army ants link up to create living bridges use to overcome gaps and obstacles they encounter along forest floors. These structures were thought to be static, but a study featuring time-lapse film has revealed that they are highly dynamic and responsive.
Coast redwoods will be shifted northward into southern Oregon, if temperatures continue to warm and current rainfall amounts remain constant. This will be a significant habitat change, compared to that which they have experienced for the last several decades.