A golden headed cisticola (Cisticola exilis, possibly a male) exhibiting an agression behavior towards other male. The cisticolas are often  defending their nest and tereitory from every other animals and humans.
<a href="//commons.wikimedia.org/wiki/User:Gupt24" title="User:Gupt24">Gupt24</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>