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It is a question that has puzzled scientists for decades: Why are some species more affected by cancer than others? Naked mole-rats, whales and elephants tend to have low rates of cancer but it is the leading cause of death for dogs and cats. Alex Cagan is a scientist at The Wellcome Sanger Institute in Cambridge and is leading a study, which hopes to answer that question. He told Newsday: “They might have better ways of protecting their DNA from damage, which could reduce their cancer risk or they may be…living in environments where they’re less exposed to the causes of cancer.” (Picture: Shows Southern right whale, eubalaena australis, mother and calf in the Valdés Peninsula. Credit: Gerard Soury via Getty Images.)