Having trapped the animals, the dangerous work at the forest research station now begins.

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Heidi also has a little fashion advice for work-at-homers who have animals.

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"She has a tremendous love for animals -- she's shown horses and done a lot of work at shelters, " Melisa Pearce said.

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Modern phylogenetics studies look at variations in animals that are known to be related, and from those can work out when specific structures evolved.

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