The rate of increase in the population of owls is calculated by dividing the increase in the number of owls by the number of years: 60 owls / 4 years = <<60/4=15>>15 owls/year.
The population will therefore increase by 15 owls/year * 2 years = <<15*2=30>>30 owls. Answer: \boxed{30}.
A population of owls in a region has increased by 60 owls in the last 4 years. At this rate, how many owls will the population grow by in the next 2 years?
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