You see a primal pack beast
Notes
It spawns with the shape of a spider egg 
and changes into the shape of a Noxious Ripptor one second later. If it's not killed in 20 seconds it becomes a Fungosaurus with full health. It's one of the 11 different types of Primal Pack Beasts.
It's part of the fight against The Primal Menace during the Primal Ordeal Quest.
Abilities
Can deal Critical Hits
Melee (0-484)
Plant Bomb (810-1332)|
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Primal Pack Beast
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Death Strike (858-1222)|
Primal Pack Beat
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3sqm Slicing Wave (?)Damage Taken From Elements
Physical 
Death
Holy
Ice
Fire
Energy
Earth
Location
Strategy
Kill them fast to avoid having to deal with the much more dangerous Fungosaurus.