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The reasons that lead some animals to seasonally migrate, and others to remain in the same area year‐round, are poorly understood. Associations between traits, such as body size, and migration provide clues. For example, larger species and individuals are more likely to migrate.
One explanation for this size bias in migration is that larger animals are capable of moving faster (movement hypothesis)...
The distribution of resources and food selection are fundamental to the ecology, life history, physiology, population dynamics, and conservation of animals. Introduced plants are changing foraging dynamics of herbivores in many ecosystems often with unknown consequences. Galapagos tortoises, like many herbivores, undertake migrations along elevation gradients driven by variability in vegetation productivity...
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