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Potter’s Dwarf Angelfish
The Potter’s Dwarf Angelfish is a difficult fish to keep and not a good choice for a beginner. It is found in the Johnston Islands and Hawaii. The males are 4 in. long, while the females are 3.1 in. There may be territorial aggression unless fish of different size is present. The minimum size tank […]
Do Horses Understand Human Expressions
In studies at the University of Sussex in the United Kingdom, horses were able to recognize differences in human facial expressions. Using photographs depicting positive and negative human facial expressions, the 28 horses used in the Sussex study showed changes in heart rate when they were shown the photos. Increased heart rate indicated an understanding […]