This is a Brook Sickleback. It has these little tiny spikes on its

This is a Brook Sickleback. It has these little tiny spikes on its back that stand up when it's stressed.

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Stickleback - an overview

This is a Brook Sickleback. It has these little tiny spikes on its back that stand up when it's stressed.

This is a Brook Sickleback. It has these little tiny spikes on its back that stand up when it's stressed.

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Stickleback - an overview

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