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Jessica Haines

Mug shot: A biologist caught this male red squirrel in the act of killing a young squirrel pup.

This newborn pup had wounds similar to the bite marks seen on other pups attacked by adult males.

Red squirrels appear to be able to tell in advance when white pine trees are going to have a "mast year," which creates a boom in seeds that the squirrels eat.

This female red squirrel's pups were killed by a male. Biologist Jessica Haines says she often saw the mother sitting near her nest (right) around the time of the attacks, possibly trying to guard her young from being attacked.

Scientists temporarily removed this squirrel pup from its nest during their research. The pups are tagged and tracked for the rest of their lives to learn about their lives and behaviour. A small sample of ear tissue is DNA-tested to determine each squirrel's paternity.

This squirrel pup, the sibling of one that was observed being killed by a male, was also attacked and killed.