Continuity mistake: The scene where Col. Hathi inspects his troops, he leans on his stick and it breaks. However, in the next scenes, the stick you see is sometimes broken and sometimes it is still complete.
Deliberate mistake: When Baloo lies unconscious, the tree behind has barely no leaves on its branches. When he wakes up and the sun shines, leaves suddenly appear.
Continuity mistake: The tip of Shere Khan's tail is orange, except when Baloo grabs it to stop him from attacking Mowgli and runs around in circles. Then it turns brown.
Continuity mistake: When Mowgli walks to the village, an extra vase suddenly appears.
Continuity mistake: When the movie begins, Bagheera walks along a branch and stops several centimeters away from a branch going upwards. When the shot changes he is standing right next to it.
Continuity mistake: Baloo's skirt made of leaves disappears when Mowgli comes to rescue him from the chimps. Also, the roots of the tree behind change looks and the weeds coming out of the tiles also disappear.
Continuity mistake: The branch where Bagheera watches Baloo's boxing lessons is parallel to the ground, but in later shots it's perpendicular, much steeper.
Continuity mistake: During the king Louie scene the number of bananas at the feet of his throne increases and decreases randomly between shots. Their position also changes.
Answer: The animals considered man a strange creature and did not understand their ways, like wearing clothes and shoes. They were scared when Mowgli brought them fire. They only knew jungle ways, they figured the humans would eat him, like any small creature left on his own. Plus they knew man as a hunter and killer.