Grandfather said. âA lot of animals in the zoo are hard for visitors to see, because theyâre nocturnal. That means they sleep during the day and are awake all night. And thatâs no fun is itâwhen you come to see the animals and theyâre asleep in their burrows?â
Much head-shaking by the children.
âSo we built a new exhibit thatâs underground,â Grandfather explained. âThere are no windows, so the animals canât see the sunshine. We have really big lights that make it as bright as day when theyâre turned on, but when the lights are off, itâs nice and dark, the way nocturnal animals like it. And once we got the animals settled down there, we started turning the lights on a little earlier each day. And then turning them off a little earlier each night. We gradually adjusted the lights so that now they go on at sunset and off at sunrise. So during the night, when all of you have to be home and asleep, the bright lights are on and all the animals are asleep. But in the daytime, like now, the lights are low, and the animals think itâs night and they come out to eat and play. So now you can see them.â
More cheers.
âNow we have to be careful as we go through the Creatures of the Night,â Grandfather said, with a slight but definitely menacing frown. âFor most of the exhibit, weâll be traveling in a kind of tunnel. Most of the animals are behind one-way glass, so we can see them but they canât really see us. But to bother them as little as possible, we keep the lights in the human tunnel very low. Youâll need to watch your step. And try not to make loud noises, because that might scare the animals. There are a couple of places where we wonât be behind glass. In the Louisiana Swamp exhibit, for example, weâll have only a railing between us and the beavers and bullfrogs and alligators.â
This statement seemed to alarm some of the childrenâat least, until Josh leaned over to one little girl who looked on the verge of tears.
âDonât worry,â he said. âAlligators donât eat people. Only crocodiles do that.â
âVery good, Josh,â Grandfather said. âThe other exhibit where you wonât have glass between you and the animals is the Bat Caveâbut Iâll explain that when we get closer.â
As he was speaking, a large bloodstained mummy came out of a nearby building and shambled over to stand at Grandfatherâs side. Its face was covered, but since it was slightly taller than Grandfather and much wider, I deduced that under its bloody bandages the mummy was Dr. Clarence Rutledge, the local veterinarian who looked after the zoo animals. The mummy bent over and whispered something in Grandfatherâs ear. Whatever the secret was, it turned Grandfatherâs usual stern expression into a scary scowl.
âBlast,â he said. âI should go and deal with that. Meg, could you come and help me with something? Clarence, you take over the tour for a couple of minutes. Take them over to the Kingdom of the Nightâbut take them the long way round.â
âPast the hyenas?â Clarence asked.
âNo, through the aviary,â Grandfather said. âThatâs about as far as you can get from the lionsâ habitat.â
With that, Grandfather strode off. For someone in his nineties he had a remarkably fast and steady stride. Clarence began gathering the class and shooing them in the opposite direction from what Grandfather had taken.
âIâll keep you posted,â I said to Michael, in an undertone, and then I set off to follow Grandfather.
âWhy are you taking the children as far as possible from the lionsâ habitat,â I asked when I caught up with him. âThe lions arenât loose, are they?â
âOf course not.â He came to a stop at the railing designed to keep people from falling into the moat around the