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Evolution of Whales

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sheily castellanos

on 25 November 2014

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Transcript of Evolution of Whales

Evolution of Whales
The Evolution of Whales
By Sheily Castellanos :-)
What is a whale's habitat?
The whale is an aquatic animal so it lives in the ocean


The mammal lives with marine life including fish, dolphins, and krill
Adaptations of the whale
Echolocation: Also called bio sonar... Whales use this to call out to their environment and they locate/identify objects

Flippers: Long ago, a whale's flippers were limbs. The whale uses flippers for balance and directional change.

Blowhole: The blowhole helps the mammals shoot out the water they take in, and breathe.
Ancestors of Whales
So what if the whale didn't have these adaptations long ago?


Through the process of natural selection, the primitive wolf evolved into modern day whales.
Sources
www.whaleworld.com/whale-habitat
en.wikipedia.lorg/wiki/cetartiodactylla
animals.pawnation.com/comparison-whale-dolphin-5526.html
Long ago, the pakicetus (48 million years ago) was completely different than whales today.
Natural Selection
Related Species
The bottlenose dolphin is a related species to the whale. They both have a
homologous structure.

Body Structure: Inherited blowholes from same ancestor and are grouped with whales that have teeth
Early Development: The cetaceans (whales, dolphins, porpoises) are marine mammal descendants of land mammals.
DNA: The cetacean family all have a similar DNA
Changing the Environment
If the whales were to change their environment to arctic waters, natural selection would have to take place.

Moving to arctic temperatures would mean that the whales need to store more blubber in order to keep themselves warm.

Their offspring would then genetically change into a much larger size, thus, creating a new species twice the size.
In Conclusion...
The evolution of whales started from their ancestors, the pakicetus, 48 million years ago. As the species slowly started getting more accustomed to water, they grew adaptations to help them survive in that environment. Long after, the species would genetically change into completely aquatic animals and produce offspring. However, the offspring would arrive at shore which meant they were able to breathe air, so overtime they developed blowholes and evolved into modern day whales. THE END :-)
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