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jan 1, 59000000 BC - Mammals are diverse and common: 59 mya

Description:

-the early true mammals were mainly small insect-eating creatures adapted to nighttime activity. They ranged in size from scarcely bigger than a bumblebee to squirrel-sized, keeping out of the way of the predatory dinosaurs
-End of period were dos, cats, and pigs.
-They acquired certain traits that would characterize mammals ever afterward: limbs positioned under the body, an enlarged brain, a more complex physiology,
Adaptive radiation
-It took several million years for the mammals to evolve even moderately large body sizes,

Added to timeline:

10 months ago
0
0
148
Global Time Scale

Date:

jan 1, 59000000 BC
Now
~ 5883516 years ago
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