est ▁crossing ▁rivers , ▁with ▁many ▁being ▁e aten ▁by ▁cro cod iles ▁or ▁d row ning ▁in ▁the ▁attempt . ▁While ▁having ▁the ▁appearance ▁of ▁a ▁f ren zy , ▁recent ▁research ▁has ▁shown ▁a ▁her d ▁of ▁w ilde be est ▁poss esses ▁what ▁is ▁known ▁as ▁a ▁" sw arm ▁intelligence ", ▁where by ▁the ▁animals ▁system atically ▁explore ▁and ▁overcome ▁the ▁obst acle ▁as ▁one . ▁ ▁E col ogy ▁ ▁Pred ators ▁Major ▁pred ators ▁that ▁feed ▁on ▁w ilde be est ▁include ▁the ▁l ion , ▁hy ena , ▁African ▁wild ▁dog , ▁che et ah , ▁le op ard , ▁and ▁cro cod ile , ▁which ▁seem ▁to ▁favour ▁the ▁w ilde be est ▁over ▁other ▁pre y . ▁Wil de be est , ▁however , ▁are ▁very ▁strong , ▁and ▁can ▁inf lict ▁considerable ▁injury ▁even ▁to ▁a ▁l ion . ▁Wil de be est ▁have ▁a ▁maximum ▁running ▁speed ▁of ▁around ▁. ▁The ▁primary ▁def ensive ▁t actic ▁is ▁her ding , ▁where ▁the ▁young ▁animals ▁are ▁protected ▁by ▁the ▁older , ▁larger ▁ones , ▁while ▁the ▁her d ▁runs ▁as ▁a ▁group . ▁Typ ically , ▁the ▁pred ators ▁attempt ▁to ▁isol ate ▁a ▁young ▁or ▁ill ▁animal ▁and ▁attack ▁without ▁having ▁to ▁worry ▁about ▁the ▁her d . ▁Wil de be est ▁have ▁developed ▁additional ▁s oph istic ated ▁co oper ative ▁behav i ours , ▁such ▁as ▁animals ▁taking ▁turns ▁sleep ing ▁while ▁others ▁stand ▁guard ▁against ▁a ▁night ▁attack ▁by