They discovered that whereas the birds on Corsica bred at the time when caterpillars a ready food source were most plentiful, the birds on the mainland were out of sync.
(the birds on Corsica; bred; T:at the time) (They; discovered; that whereas the birds on Corsica bred at the time when caterpillars a ready food source were most plentiful, the birds on the mainland were out of sync) Context(They discovered,List([0, 15))):(the birds on the mainland; were; out of sync)
They discovered,List([0, 15))
the birds on Corsica They the birds on the mainland
bred discovered were
T:at the time
that whereas the birds on Corsica bred at the time when caterpillars a ready food source were most plentiful, the birds on the mainland were out of sync
out of sync