1 The blackbird is feeding its chicks.
2 The beaver is building a dam.
3 The chameleon is catching an insect with its tongue.
4 The fish is (protecting/fighting) the other fish. (Рыба защищает другую рыбу, или борется с другой рыбой, выберешь сам(а)) Борется - fighting, protecting - защищает.
5 The bear is hunting the salmon.
6 Falcon is chasing a group of smaller birds.