. Bulletin - Biological Survey. Zoology, Economic. 92 WOODPECKERS IN RELATION TO TREES. Joseph Grinnell records the following observation upon the same species of woodpecker: At Seven Oaks, June 24,1906, we had been watching a Sierra sapsucker (Sphyrapicus v. daggetti) industriously running a line of bark pits around the branch of an alder, when a California woodpecker . . flew down and drove off the sapsucker . . then went the rounds of the borings himself, "dipping" from This observation suggests that the other records of species of wood- peckers besides sapsuckers tapping t
. Bulletin - Biological Survey. Zoology, Economic. 92 WOODPECKERS IN RELATION TO TREES. Joseph Grinnell records the following observation upon the same species of woodpecker: At Seven Oaks, June 24,1906, we had been watching a Sierra sapsucker (Sphyrapicus v. daggetti) industriously running a line of bark pits around the branch of an alder, when a California woodpecker . . flew down and drove off the sapsucker . . then went the rounds of the borings himself, "dipping" from This observation suggests that the other records of species of wood- peckers besides sapsuckers tapping trees should refer only to their purloining sap from punctures made by the latter. Be that as it may, the assertion has frequently been made that some of our wood- peckers, notably the downy and the hairy, mark trees in a fashion almost indistinguishable from that of the sapsucker. Some of the European woodpeck- ( . ers very closely re- , ... ( ^:v lated to our species of the genus Dryobates do a great deal of similar work, even producing large swol- len girdles on trees,2 and it would be sur- prising if our species were found to be en- tirely innocent of such practices. Mr. Henry Bryant, of Boston, published the following testi- mony in 1866: It lias long been known that si line of our smaller woodpeckers pick out por- tions of the sound bark of trees, particularly of apple trees, where there are no larva- and apparently no inducement for them to do so. . They [the pecks] are generally seen in circles round the limbs or trunks of small irregularly rounded holes, and in this vicinity are made almost exclusively by the downy woodpecker, I', pubescens, aided occasionally by the hairy woodpecker, P. Dr. J. A. Allen corroborates these statements as follows: The perforations made in the bark of trees by woodpeckers, forming transverse rings, and sometimes so numerous as to do serious injury to the trees, have of late been very commonly attributed almost solely to this spec
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