It is narrated from Sayyiduna Salman al-Farisi (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "On the day Allah, the Mighty and Majestic, created the heavens and the earth, He created a hundred mercies; each mercy fills what is between the heaven and the earth. Among them is one mercy through which a mother shows tenderness to her child and wild animals show tenderness to one another, and He has held back ninety-nine mercies for the Day of Resurrection."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 6119