Fish Fish engage in nest building activities ranging from simply scooping out sediment to building enclosed structures out of plant matter. Male sticklebacks produce a special enzyme in their kidneys that they use to bind plants together.
FIsH Fish eNgAgE iN NEst BUIldING activIties RangInG FroM simply scOopIng out SEdimenT To buildInG enClosED StrucTures out of Plant maTteR. Male sticklebaCKs ProDuce a speciaL eNZyME in theiR kIdNeYs thAt ThEy use to binD Plants TOGeThER.