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Almost
everyone (enjoy) ___ enjoys ___ (1) visiting a zoo. Today
zoos are common. The first zoo (establish)
____________ (2) around 3500 years ago by an Egyptian queen for her
personal enjoyment. Five hundred years later, a Chinese emperor (establish) ____________ (3) a huge
zoo to show his power and wealth. Later zoos (establish) ____________ (4) for the purpose of studying
animals.
Some
of the early European zoos were dark holes or dirty cages. At that time,
people (disgust) ____________ (5)
by the bad conditions and the mistreatment of the animals. Later, these early
zoos (replace) ____________ (6)
by scientific institutions where animals (study) ____________ (7) and (keep) ____________ (8) in good condition. These research
centers (become) ____________ (9)
the first modern zoos.
As
early as the 1940s, scientists (understand)
____________ (10) that many kinds of wild animals faced extinction. Since
that time, zoos (try) ____________
(11) to save many endangered species, but relying on zoos to save species
such as the rhinoceros is not enough. In the 1980s, the number of rhinos in
the world (reduce) ____________
(12) from 10,000 to 400. Many rhinos (kill)
____________ (13) by poachers, but many also (die) ____________ (14) in captivity. Zoo breeding programs for
rhinos have not been successful. The best method of conservation (be) ____________ (15) to leave them
in their natural habitat. By 1999, there (be) ____________ (16) more than 13,000 rhinos again living in
the wild. These rhinos (save) ____________
(17) from extinction by the strong conservation methods of local
communities, government agencies, and private landowners. Wildlife biologists
still fear that some subspecies of the rhino in Africa and Indonesia (become) ____________ (18) extinct in
the near future. Some scientists (believe)
____________ (20) that half of all animal species in zoos will also be in
danger of extinction by the middle of this century.
Because
zoos want to treat animals humanely and encourage breeding, today animals (put) ____________ (21) in large,
natural settings instead of small cages. They (watch) ____________ (22) carefully for any signs of disease and
(feed) ____________ (23) a balanced
diet. Most zoos (have) ____________
(24) specially trained veterinarians and a hospital for animals.
They
also have specially trained keepers. Food (prepare) ____________ (25) in the zoo kitchen. The food program
(design) ____________ (26) to
satisfy the animals' particular needs. For example, some snakes (feed) ____________ (26) only once a
week, while some birds (feed) ____________
(27) several times a day. Today zoo animals (treat) ____________ (28) well, and zoo breeding programs are
important in the attempt to save many species of wildlife.
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