1.   Several rare South American mammals escaped from the zoo, not to mention a three-metre-long python.

2.   The entire Gulf population of the dugong, or sea cow, a relatively rare marine mammal, was also at risk.

3.   International concern for these extremely rare mammals arose after thousands of grey seals were wiped out by the canine distemper virus.

4.   The least sign of man panics the rare mammal, prompting him to have a nervous breakdown and abandon his cave to perish.

5.   The rare marine mammals could be on a collision course with the Bush administration, too.

6.   Two more rare mammals are found at the conclusion of the river tours.

7.   Elephants have been notorious for destroying plantations in the area, resulting in frequent killings of the rare mammals by local communities.

a. + mammal >>共 161
marine 24.32%
small 9.73%
large 6.13%
first 4.68%
adult 2.52%
only 1.44%
rare 1.44%
huge 1.44%
endangered 1.26%
flying 1.26%
rare + n. >>共 1661
occasion 3.30%
case 2.82%
disease 2.38%
opportunity 2.21%
moment 1.96%
appearance 1.89%
form 1.79%
exception 1.47%
species 1.46%
book 1.42%
mammal 0.10%
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