Sentences with phrase «oldest land mammal»

Not exact matches

«Walking Whale» Fossil Discovered In Peru: 40 - Million - Year - Old Specimen May Be Link Between Aquatic and Land Mammals

«As long as the older trees are not so stressed that they do not produce many viable seeds, [and] the dispersal mechanism — for example, wind, birds, mammals — is present, and the habitat where the seed lands has the appropriate soil, nutrients and temperature,» says biologist Terry Root of Stanford University, who was not involved in the study, «then the trees will be able to shift.»

In fact, until this find, the oldest monkeys in Central America were presumed to be less than 5 million years old, when many mammals stampeded over a land bridge between the continents.

Polar bears are one of the most sensitive Arctic marine mammals to climate warming because they spend most of their lives on sea ice.35 Declining sea ice in northern Alaska is associated with smaller bears, probably because of less successful hunting of seals, which are themselves ice - dependent and so are projected to decline with diminishing ice and snow cover.36, 37,38,39 Although bears can give birth to cubs on sea ice, increasing numbers of female bears now come ashore in Alaska in the summer and fall40 and den on land.41 In Hudson Bay, Canada, the most studied population in the Arctic, sea ice is now absent for three weeks longer than just a few decades ago, resulting in less body fat, reduced survival of both the youngest and oldest bears, 42 and a population now estimated to be in decline43 and projected to be in jeopardy.44 Similar polar bear population declines are projected for the Beaufort Sea region.45