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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
Elephant footprints (tire tracks for scale)
People whose behaviors violate norms are often called mentally ill. “Why else would they do such ...
Cutaway Drawing of Tholos, The So-called Treasury of Atreus
The nucleus is bounded by a double membrane called the nuclear envelope