Bull, as we all know, especially the dairy breeding ones, are considered dangerous. We have sports like Jallikattu (for which there was a large hue and cry in Tamilnadu last year because they were banned) involves bulls because of their ferocious and wild nature.
But this photograph, taken in Mumbai Airport (they have very good displays of Indian culture and tradition throughout the airport) is that of Nandi, a bull nonetheless, but also a deity in Hinduism. He guards the gates of Mount Kailasa, the abode of Lord Shiva. You can get to know him more through this Wikipedia article. You will see him in all the Shiva temples (and also in Temples where Shiva’s family resides 😉 )