Insects are ectothermic, which means their internal body temperatures are regulated by surrounding environmental temperatures. Researchers suggest the key to surviving cold winter temperatures for some species is to maintain a balanced salt and water blood concentration.
Crocodiles may not be able to adjust to warming waters, researchers say. A recent study found saltwater crocodiles tend to take shorter dives when waters exceed 31.5 degrees Celsius. This could have significant impact on the species' survival.