The Prophet (pbuh) not only preached to the people to show kindness to each other but also to all living souls. He forbade the practice of cutting tails and manes of horses, of branding animals at any soft spot, and of keeping horses saddled unnecessarily. [Sahih Muslim] If he saw any animal over-loaded or Milad he would pull up the owner and say,
"Fear Allah in your treatment of animals." [Abu Dawood]
A companion came to him with the young ones of a bird in his sheet and said that the mother bird had hovered over them all along. He was directed to replace her offspring in the same bush (Mishkat, Abu Dawood)
During a journey, somebody picked up some birds eggs. The bird's painful note and fluttering attracted the attention of the Prophet (pbuh), who asked the man to replace the eggs. [Sahih Bukhari]
