# data[].attributes.body
in the year 1976 the rainfall was 130mm, in 1977 the rainfall was 20mm and then in 1978 the rainfall went back up to 540mm to around its normal rainfall per year. so in 1976 and 1977 there was a drought.

# data[].attributes.body
during the drought the portulaca seed decreased from 18 to 0 per square meter from 1976-1978. The tribulus seed decreased from 14 to 4 per square meter.

# data[].attributes.body
the population went from 751 in 1976 to 93 in January of 1978 to back up in 306 in June of 1978

# data[].attributes.body
Because of the drought it caused the Portulaca seeds to decrease to 0 so the birds that didn't have evolved beaks couldn't eat the Tribulus seeds so they had nothing to eat.

# data[].attributes.body
because the Portulaca seeds decreased to 0 they non evolved birds couldn't eat it and died from starvation but the ones who did have evolved harder and longer beaks could eat the Tribulus seeds so they didn't starve.

# data[].attributes.body
Because of the lack of food especially with the Portulaca seed going extinct on the island the non-evolved birds died from starvation because they didn't have any food which caused a decrease in the population making it go down.