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Some male birds and mammals congregate in communal courting grounds called leks.
Reindeer antlers grow again each year under a layer of fur called velvet. This reindeer is losing th
Painting of a Colonial American boy holding a pet squirrel.
Diphtheria. The bacteria that cause this disease, called Corynebacterium diphtheriae, proliferate in
Still holding the head with one hand, apply effleurage to scalene muscles with fingertips, from ...
Cystic fibrosis is caused by a mutation in a protein called CFTR