Simplify the following text for a Grade 12 native English-speaking person.
Original: Ostrom noted the small body , sleek , horizontal , posture , ratite-like spine , andâ '' especiallyâ '' the enlarged raptorial claws on the feet , which suggested an active , agile predator .
Simplified: Ostrom noted the small body , sleek , horizontal , posture , andâ '' especiallyâ '' the enlarged claws on the feet , which suggested an active , agile predator .