Hearings on the lead-up to the US government’s $700-billion Wall Street bailout are investigating the collapse of financial giant Lehman Brothers. Lehman Chief Executive Richard Fuld was one of those grilled (Image: KPA / Zuma / Rex) Some cotton-top tamarins (Saguinus oedipus) will forfeit a piece of food if it stops an unrelated monkey getting more. That looks a lot like spite – but the monkeys’