In the lead-up to summer, tulip trees and hop trees become dotted with small, black cocoons around the eastern Great Lakes. The husks are created by small, greenish-gray caterpillars that go through ...
1959b. The genetics of Papilio dardanus Brown. J Genet, (in press). Fisher, R A. 1928. The possible modification of the response of the wild type to recurrent mutations. Amer Nat, 62, 115–126.
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