# data[].attributes.body
During the time span from 1976 to 1978 there had been a severe drought. This killed off the seeds that the finches ate. The porticala was an especially important seed that died because it was soft and easy for the birds to eat. This caused the population of the birds to go down a lot. The birds with the bigger beaks survived and reproduced. Thanks to natural selection the offspring were born with bigger and thicker beaks then the birds before them which helped them get more seeds and survive and live long enough to produce offspring.

# data[].attributes.body
Beak size comparatively    ( '76-'78)
1976 : depth 9.6 mm
length 10.7 mm
Drought of 1977
1978 : depth 10.5 mm
length 11.6 mm

# data[].attributes.body
The drought numbers
1976 : 130 mm of rainfall
1977 : 20 mm of rainfall (drought)
1978 : 540 mm of rainfall

# data[].attributes.body
The lack of portacla seeds
1976 :  10 seeds per meters squared
1977 : 0 seeds per meters squared
1978 : 0 seeds per meters squared

# data[].attributes.body
The microevolution that the galapagos islands went through caused natural selection for finches