Name an adaptation for birds that might hinder their migration. Name an adaptation/barrier for mammals that prevents them from carrying out migration.
A) Birds: Territorial behavior; Mammals: Lack of specialized navigation skills
B) Birds: Inability to store sufficient energy; Mammals: Inability to form social groups
C) Birds: Large wingspan; Mammals: Dependency on specific food sources
D) Birds: Strong territorial instincts; Mammals: Limited endurance for long journeys