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elephant-trunk fish| African freshwater fish Gnathonemus petersii in the order Mormyriformes. They grow to about 23 cm/9 in in length, have small eyes and fins and are mainly nocturnal. They generate an electric field which they use to detect obstacles. Elephant-trunk fish live in lakes in West and Central Africa. |
| Their brains are very large in proportion to their bodies: 3.1% of body mass compared with less than 1% for most fish and 2.3% for humans. |
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