The Penguin Calendar

The chart above shows five activities of penguins over a period of one year，month by month．They are hole staying，nest building，（71）　　，chick raising and moulting．The penguins stay in the （72）　　 most of the year，from January to October．In July，they begin to build nests，just （73）　　 （before/after） they lay eggs．Chick raising lasts five months，from September to the next （74）　　．After chicks come out of the eggs，they begin to lose their baby hair，which is called moulting．It usually takes about （75）　　 months，from February to May．