Riddles for Endangered Species

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Across
  1. 3. Whose ocean dance, disrupted by fate, as fishermen harvest, pushes them towards a dire state?
  2. 6. In icy realms where seals play, who struggles as the ice melts away?
Down
  1. 1. What majestic creature, hunted sly, for its valuable horn, faces a desperate cry?
  2. 2. In sandy nests, a ritual embraced, which shelled wanderers face disturbance due to a human trace?
  3. 4. In the shadows where forests dwindle, which noble primate faces a habitat that continues to dwindle?
  4. 5. In the wild, where danger is sworn, who wears a crown of ivory, mourned by those unborn?