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Show How Dlrds Build Nests. . 1 Swallows aud house martins build 1 by sticking together pellets of .pre . K pared rood mud. Most of tho material . 1 Is obtained from thp drying jmddjes, I on the high roads. If not mixed with I anything else tho tendency of' theso" B pellets would bo to- crumble when dry. I But tho swallow trlbo Is supplied with' a mucous secretion which ennbles If, B to gum those particles together. r Tho K swallows' nests, from which tho, Chi- K . neso "bird's nest so'up" Is ,mado,iiro' constructed of! this' mucous ' mattor K only. An Indian swallow which builds' I little boat-shaped nests against tho H trunks of lofty trees practically makes them of -dried saliva. H |