Parus major is a bird species that depends on caterpillars as a food source for its young. Caterpillars are most abundant during spring. The yearly increase in temperatures during springtime has gradually shifted, resulting in caterpillars developing approximately two weeks earlier than in the past. How will the changes in the availability of caterpillars most likely affect future populations of P. major? P. major will change their food source to plant leaves.
P. major will change their food source to plant leaves.

P. major will lay their eggs earlier in the year.
P. major will lay their eggs earlier in the year.

P. major will decrease the number of eggs laid at a time.
P. major will decrease the number of eggs laid at a time.

P. major will hunt caterpillars earlier in the day when temperatures are cooler.