Wednesday, May 13, 2015

Natural selection videos

Video 1

The first video is about how baby barnacle geese have to jump off the cliff face to get food at bottom. First the father jumps down so that the babies follow. But they don't follow. After the mother jumps they jump. The babies need hollow bones so that they don't break them when they hit the rocks. Their softness also helps because they don't hit the wall hard. Only the ones with better bones and more softness survive. The others don't survive because the are not so strong. They had to leave 2 because they wanted to get away from predators.

Video 2

The second video is about how a three month old arctic has to survive alone through 6 months of harsh winter. To survive they have to have soft paws to walk for a long time and to dig for food in the snow. Also they had to have strong legs to jump into lemming holes for food. If they didn't have these traits they couldn't survive. This natural selection makes sure that only the strongest foxes survive the winter.


Monday, May 11, 2015

Evolution Project


Past

The Rhinoceros comes from a group of mammals called perissodactyls. The horses and zebras also come from that group. The Rhino is believed to come directly from a huge dinosaur called the Paraceratherium. It evolved into two different branches: the one horned animals and the two horned animals. The Paraceratherium then shrunk and evolved a horn or two horns.

The present

The Rhino evolved a horn to defend itself from other predators and to impress females. Also, it evolved a large upper lip to grab leaves off trees and to eat break branches. It evolved short legs to run faster through the long savannahs.


The future

In the future the rhino will live in the forest because the savannahs will burn up so the rhinos will adapt to the forest. It will evolve longer legs to move easier through rock and mud. The legs will also help it reach higher trees for food. It will evolve a larger horn to scare off bigger predators like bears and pumas.

References