Birds build nests as safe, temporary homes where they can lay and incubate eggs and raise their chicks. To keep the structures sturdy, many birds weave in spider silk or use mud. Some even use their own saliva to glue materials together.
Birds build nests as safe, temporary homes where they can lay and incubate eggs and raise their chicks. To keep the structures sturdy, many birds weave in spider silk or use mud. Some even use their own saliva to glue materials together.