Saturday, May 16, 2015

Rabbit Evolution Proyect

The oldest ancestor of the rabbits and almost of every rodent is the Lagomorfa, this creature lived 53 million years ago. The rabbit has evolved from the Lagomorfa by growing longer legs and having a smaller size to be able to escape from the predator and be able to hide in the bushes. For all rodents there has not been found a clear fossil of the Lagomorfa but instead has been found bones and pieces of the whole specie.

The rabbit has adapted to its environment by making holes in which it hides to escape from the predator. Over the last few years, scientist have discovered that their ears have started to "fold" more towards there body, letting them fit through small spaces and hiding from the predator. Rabbits have long stretched paws to be able to run quickly and hop, allowing them to live in forests with bring branches, high trees and big animals.

I belief in the future, rabbits will evolve a thicker skin, they will start to move toward Asia, Africa and America, due to the climate change that will decrease the temperature of whole Europe. They will evolve into a different skin, kind of "spikes" (thicker skin) that will protect their skin from the sun rays and from predators. The usual colors (black, white, brown and gray) will vary to be able to allow camouflage in trees, bushes and plants.

Fossil Find

I think this is a cat because it has a similar structure, the legs are in a postion to notice it has legs that are made for running or walking, not to fly or swim. The tail indicates that this is a cat. This could be thought to be a rabbit or a cat but since it has longer legs that are equal on both sides and a long tail it indicates it is a cat. The legs of a rabbit are shorter and different from the ones below, the legs of a cat are long and have joints that allow them to jump, run, walk and climb. The caracteristics of the skull are long teeth, oval shape and a bone that could show were the ears are. The skull of a rabbit has a different shape and a mouth that only holds small teeth that are not sharp.

Thursday, May 14, 2015

Natural Selection

Natural Selection was demonstrated in the videos we saw with the birds, by having lighter bones and more ability to jump they would survive, and if they didn't it would represent a weak specie, this characteristics would help build a specie that is stronger and more equipted to the environment. We also saw how the kangaroos fought and the one that won, showed it was the strongest and got to reproduce with all the females, this is how the specie then becomes stronger; getting rid of all the weak males and changing into a better, stronger one. Like showed in the foxes, the one who got the food was the one that had the best smell and could track from away the prey, this would make only the strong ones survive and leave the weak ones to die, which means the stronger and more prepared to the environmental challenges was the one who would have offspring with similar abilities.