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evolution of tigers

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by

Samantha Furgiuele

on 5 November 2013

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Transcript of evolution of tigers

Evolution Of Tigers
Ancestors
Environment
Tropical Rainforests
Evergreen Forests
Tall Grasslands
Mangrove Swamps
Savannas
Temperate Forests
Snow
Bengal Tiger
Live in South Asia
Grasslands and savannas
Light colored
Short fur
Characteristics
Subspecies
Amur
Bengal
Indochinese
Malayan
South China
Sumatran
South China Tiger
Live in South China
Evergreen Forests
Dark colored coat
Short fur
Stripe patten
Large padded paws
Claws
Whiskers
Large, sharp teeth
Long Tail
Long hind legs
Locations
Proailurus
First known cat
lived about 36.5 million years ago
small
weighed twenty pounds
short legs, long body
retractable claws
Lived 50 million years ago
15 million years after the mass extinction of dinosaurs
Carnivorous
Pseudaelurus
Lived 23.5 million years ago
very similar to Proailurus
slightly larger
had 8 more teeth than cats today
Miacids
"Panthera Tigris"
Flexible spine
Sexual Selection
Flehmen Reaction
Female leaves scent trail
Attracts male
Courting rituals
Artificial Selection
White tigers
haven't been seen in the wild since the 1950's
some live in captivity
Divergent Evolution
Convergent Evolution
Zebra's and Tigers developed stripes
different pressures led to same result
Natural Selection
Tigers selected in favor of must of had:
More stripes
Longer claws and hind legs
More flexible spine
Longer tails
1. More Stripes
More stripes to better blend in when stalking prey
2. Longer Claws and Hind Legs
Longer claws can dig further into prey
Longer hind legs allows for more jumping distance
3. More Flexible Spine
Flexibility in spine allows for faster running
more efficient hunting
4. Longer Tails
Balance
Momentum
Communication
Genetic Drift
occurred through bottle neck effect
poaching lowered population
Courting Ritual

male roars and moans
if female responds, mating takes place
do a dance of smelling, purring and rubbing
Full transcript