Why do both male and female nuthatches smear spruce or pine pitch (resin or sap) on the cavity entrance during nest building?
Why do both male and female nuthatches smear spruce or pine pitch (resin or sap) on the cavity entrance during nest building?
⦁To mark their territory and communicate with other nuthatches
⦁It is a decorate element to attract a mate
⦁To reduce the size of the entrance and protect the nest
⦁It is a random behaviour with no known purpose
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Spruce Trees of Canada
Spruce trees are sometimes confused with other evergreens like pine and fir trees. Pine needles are longer, even those of the Jack pine, and both pine and fir needles tend to be gentler on your fingers than spruce needles when you approach from the tips. The needles of a spruce tree are arranged all around the twig.
Spruce needles are four-sided except for the flattened Sitka needles, which have a little dip at the bottom, like the keel of a boat. Another clue that you’re looking at a spruce is if there are little pegs protruding from the twig at the point where the needle attaches.
