Changes

Most [[bird]]s use [[migration]] to avoid harsh seasonal conditions; the common poorwill, a type of [[nightjar]], is the only bird known to hibernate. Historically, [[swallow]]s were believed to hibernate at the bottom of ponds.

Most [[bird]]s use [[migration]] to avoid harsh seasonal conditions; the common poorwill, a type of [[nightjar]], is the only bird known to hibernate. Historically, [[swallow]]s were believed to hibernate at the bottom of ponds.

Animals which become inactive is summer are said to [[Aestivation|aestivate]].

Animals which become inactive in summer are said to [[Aestivation|aestivate]].

[[Category:Biology]]

[[Category:Biology]]