Data from: Parasites favor intermediate nestling masses and brood sizes in cliff swallows

Charles R. Brown & Mary Bomberger Brown
A challenge of life-history theory is to explain why animal body size does not continue to increase, given various advantages of larger size. In birds, body size of nestlings and the number of nestlings produced (brood size) have occasionally been shown to be constrained by higher predation on larger nestlings and those from larger broods. Parasites also are known to have strong effects on life-history traits in birds, but whether parasitism can be a driver...
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